50 câu hỏi
Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three tin the pronunciation in each of the following questions
donkey
won
dozen
monkey
Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three tin the pronunciation in each of the following questions
parked
hoped
packed
wicked
Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of the primary stress in each of the following questions
considerate
Parisian
redundancy
agriculture
Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of the primary stress in each of the following questions
epoch
etiquette
equivalent
episode
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
She clearly joined the firm with a(n) ___________ to improving herself professionally
view
aim
plan
ambition
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
It's inevitable that there will be ___________ in the workforce over the coming months
takeovers
cutbacks
letouts
offcuts
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
Before giving presentation, always ___________ the focus on the projector so that everyone can read what is on the screen
adjust
move
change
rectify
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
Tomorrow will be mainly sunny. There may be a few showers but these are not expected to ___________ long
take
stay
last
survive
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
Due to popular demand by the staff members, the scheduled talk by Mr. Smith will take place___________ Room 15 instead of Room 20 as was first planned.
in
on
of
as
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
The government issued a warning to local companies that all waste must be disposed of___________ or they will face heavy fines
corrects
correcting
correction
correctly
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
A quick look would reveal that France has twice ___________ computers
more televisions than
many as televisions as
as many televisions as
as many as televisions
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
The festival has many attractions. It will include contemporary orchestra music and an opera. ___________ there will be poetry readings and theatrical presentations
Otherwise
Furthermore
Nevertheless
On the other hand
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
There are many ___________ in our library
interesting American old history books
old American interesting history books
interesting old American history books
American interesting old history books
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
I'd rather you ___________ the kids drop bits of pizza all over my new sofa
won't let
didn't let
don't let
aren't letting
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
In the early years of the 20th century, several rebellions ___________ in the northern parts of the country.
turned out
rose up
broke out
came up
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
I don't like to ask people for help as a rule but I wonder if you could ___________ me a favor
make
do
find
pick
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
We live in a large house in ___________ middle of the village.
a
an
the
No article
Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions
I extend my sincere ___________ to the family and friends of John Miller, who has suddenly left us at the age of 54
appreciation
description
condolences
charges
Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined bold word(s) in each of the following questions
If people's interference with the environment decreases, more species will survive and produce offspring
result
descent
ancestor
children
Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined bold word(s) in each of the following questions
Animals on earth fascinate us with their beauty, their grace and their speed
captivate
amuse
satisfy
improve
Mark the letter A, B, C, or D to indicate the word(s) OPPOSITE in meaning to the underlined bold word(s) in each of the following questions
She just collects the stamps from discarded envelopes that her relatives and friends give her
disposed
discharged
thrown away
kept
Mark the letter A, B, C, or D to indicate the word(s) OPPOSITE in meaning to the underlined bold word(s) in each of the following questions
Not only my study but my hobbies also really keep me occupied every time
worried
busy
free
relaxing
Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges
Thomas and Peter are meeting after a long time.
Thomas: "How have you been recently?”
Peter: “ ___________”
I am going on holiday next week
Pretty busy, I think
By car, usually
I am working here
Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges
George and Frankie are talking about their hobbies.
George: “In my opinion, action films are exciting".
Frankie: “___________”
What are opinion!
There's no doubt about it.
Yes, you can do it
Your opinion is exactly
Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks from 25 to 29
Tourism is a big business. Millions of people around Europe spend their winters planning their destinations for the following summer, and their summers (25) ___________ to foreign climes for two weeks in the sun. They are the modern-day descendants of the aristocrats and the wealthy who would take months to complete the "Grand Tour” of Europe. But unlike their forefathers, tourists these days get a bad press. They're not (26) ___________ in the local culture, we're told they're just after the chance to behave a bit more wildly than they do at home. What's more, they damage the local environment and don't respect the locals and their way of life.
But are tourists really to blame? (27) ___________is it the fault of the tourist industry, which has failed to provide reasonably-priced alternatives? And if the local resort only offers a succession of bars for the tourists to visit, can we really criticize them for not doing more cultural activities? One holiday company, Far and Away, claims that tourists are crying out for more cultural holidays and believes that it has (28) ___________to come up with a range of package holidays which are affordable, culturally interesting, and environmentally friendly. Their brochure, which is to be (29) ___________ later this month, offers 200 holidays based on cultural themes, including history and architecture, learning the language, meeting the locals.
taking away
moving away
taking off
jetting off
Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks from 25 to 29
Tourism is a big business. Millions of people around Europe spend their winters planning their destinations for the following summer, and their summers (25) ___________ to foreign climes for two weeks in the sun. They are the modern-day descendants of the aristocrats and the wealthy who would take months to complete the "Grand Tour” of Europe. But unlike their forefathers, tourists these days get a bad press. They're not (26) ___________ in the local culture, we're told they're just after the chance to behave a bit more wildly than they do at home. What's more, they damage the local environment and don't respect the locals and their way of life.
But are tourists really to blame? (27) ___________is it the fault of the tourist industry, which has failed to provide reasonably-priced alternatives? And if the local resort only offers a succession of bars for the tourists to visit, can we really criticize them for not doing more cultural activities? One holiday company, Far and Away, claims that tourists are crying out for more cultural holidays and believes that it has (28) ___________to come up with a range of package holidays which are affordable, culturally interesting, and environmentally friendly. Their brochure, which is to be (29) ___________ later this month, offers 200 holidays based on cultural themes, including history and architecture, learning the language, meeting the locals.
devoted
eager
keen
interested
Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks from 25 to 29
Tourism is a big business. Millions of people around Europe spend their winters planning their destinations for the following summer, and their summers (25) ___________ to foreign climes for two weeks in the sun. They are the modern-day descendants of the aristocrats and the wealthy who would take months to complete the "Grand Tour” of Europe. But unlike their forefathers, tourists these days get a bad press. They're not (26) ___________ in the local culture, we're told they're just after the chance to behave a bit more wildly than they do at home. What's more, they damage the local environment and don't respect the locals and their way of life.
But are tourists really to blame? (27) ___________is it the fault of the tourist industry, which has failed to provide reasonably-priced alternatives? And if the local resort only offers a succession of bars for the tourists to visit, can we really criticize them for not doing more cultural activities? One holiday company, Far and Away, claims that tourists are crying out for more cultural holidays and believes that it has (28) ___________to come up with a range of package holidays which are affordable, culturally interesting, and environmentally friendly. Their brochure, which is to be (29) ___________ later this month, offers 200 holidays based on cultural themes, including history and architecture, learning the language, meeting the locals.
Or
If
When
Although
Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks from 25 to 29
Tourism is a big business. Millions of people around Europe spend their winters planning their destinations for the following summer, and their summers (25) ___________ to foreign climes for two weeks in the sun. They are the modern-day descendants of the aristocrats and the wealthy who would take months to complete the "Grand Tour” of Europe. But unlike their forefathers, tourists these days get a bad press. They're not (26) ___________ in the local culture, we're told they're just after the chance to behave a bit more wildly than they do at home. What's more, they damage the local environment and don't respect the locals and their way of life.
But are tourists really to blame? (27) ___________is it the fault of the tourist industry, which has failed to provide reasonably-priced alternatives? And if the local resort only offers a succession of bars for the tourists to visit, can we really criticize them for not doing more cultural activities? One holiday company, Far and Away, claims that tourists are crying out for more cultural holidays and believes that it has (28) ___________to come up with a range of package holidays which are affordable, culturally interesting, and environmentally friendly. Their brochure, which is to be (29) ___________ later this month, offers 200 holidays based on cultural themes, including history and architecture, learning the language, meeting the locals.
succeeded
managed
achieved
resulted
Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks from 25 to 29
Tourism is a big business. Millions of people around Europe spend their winters planning their destinations for the following summer, and their summers (25) ___________ to foreign climes for two weeks in the sun. They are the modern-day descendants of the aristocrats and the wealthy who would take months to complete the "Grand Tour” of Europe. But unlike their forefathers, tourists these days get a bad press. They're not (26) ___________ in the local culture, we're told they're just after the chance to behave a bit more wildly than they do at home. What's more, they damage the local environment and don't respect the locals and their way of life.
But are tourists really to blame? (27) ___________is it the fault of the tourist industry, which has failed to provide reasonably-priced alternatives? And if the local resort only offers a succession of bars for the tourists to visit, can we really criticize them for not doing more cultural activities? One holiday company, Far and Away, claims that tourists are crying out for more cultural holidays and believes that it has (28) ___________to come up with a range of package holidays which are affordable, culturally interesting, and environmentally friendly. Their brochure, which is to be (29) ___________ later this month, offers 200 holidays based on cultural themes, including history and architecture, learning the language, meeting the locals.
brought up
brought out
brought off
brought around
Read the following passage and mark the letter A, B, C, or Don your answer sheet to indicate the correct answer to each of the questions from 30 to 34
The term "dyslexia” is used to describe a number of problems associated with reading, writing or spelling. Short-term memory, mathematics, concentration, personal organization and sequencing may also be affected. We do not know exactly what causes dyslexia, but we do know that it tends to run in the family. We also know that more boys suffer from dyslexia than girls and that dyslexia is more common in urban areas than in rural.
One of the most common signs of dyslexia is “reversals”. People with this kind of problem often confuse letters like “b” and "a" when reading and writing or they sometimes read and write words like "tip" and "won" as “pit” and “now”. Other common characteristics are lack of punctuation, misspelling, mixed-up sentence structure and poor grammatical construction.
People are born with dyslexia, but it is only when they begin to learn to write that it becomes a noticeable problem. For children with dyslexia, going to school can be a traumatic experience. Poor achievement can make them feel frustrated and insecure. They are reluctant to go to school and sometimes even skip school together, Cheating, stealing and experimenting with drugs can also occur when children regard themselves as failures.
It is a common misconception that dyslexic people are of inferior intelligence. Yet Albert Einstein, Leonardo da Vinci, Thomas Edison and Hans Christian Andersen were apparently all dyslexic. There is no total cure for dyslexia; however, the effects of dyslexia can be lessened with the guidance of skilled specialists and a lot of determination
When does it become apparent that a child may be suffering from dyslexia?
when they are born
when they begin their education
when they use symbols instead of words
when they start talking
Read the following passage and mark the letter A, B, C, or Don your answer sheet to indicate the correct answer to each of the questions from 30 to 34
The term "dyslexia” is used to describe a number of problems associated with reading, writing or spelling. Short-term memory, mathematics, concentration, personal organization and sequencing may also be affected. We do not know exactly what causes dyslexia, but we do know that it tends to run in the family. We also know that more boys suffer from dyslexia than girls and that dyslexia is more common in urban areas than in rural.
One of the most common signs of dyslexia is “reversals”. People with this kind of problem often confuse letters like “b” and "a" when reading and writing or they sometimes read and write words like "tip" and "won" as “pit” and “now”. Other common characteristics are lack of punctuation, misspelling, mixed-up sentence structure and poor grammatical construction.
People are born with dyslexia, but it is only when they begin to learn to write that it becomes a noticeable problem. For children with dyslexia, going to school can be a traumatic experience. Poor achievement can make them feel frustrated and insecure. They are reluctant to go to school and sometimes even skip school together, Cheating, stealing and experimenting with drugs can also occur when children regard themselves as failures.
It is a common misconception that dyslexic people are of inferior intelligence. Yet Albert Einstein, Leonardo da Vinci, Thomas Edison and Hans Christian Andersen were apparently all dyslexic. There is no total cure for dyslexia; however, the effects of dyslexia can be lessened with the guidance of skilled specialists and a lot of determination.
According to the passage, dyslexic children___________
might have behavioral problems
end up taking drugs
look forward to going to school
do well at school
Read the following passage and mark the letter A, B, C, or Don your answer sheet to indicate the correct answer to each of the questions from 30 to 34
The term "dyslexia” is used to describe a number of problems associated with reading, writing or spelling. Short-term memory, mathematics, concentration, personal organization and sequencing may also be affected. We do not know exactly what causes dyslexia, but we do know that it tends to run in the family. We also know that more boys suffer from dyslexia than girls and that dyslexia is more common in urban areas than in rural.
One of the most common signs of dyslexia is “reversals”. People with this kind of problem often confuse letters like “b” and "a" when reading and writing or they sometimes read and write words like "tip" and "won" as “pit” and “now”. Other common characteristics are lack of punctuation, misspelling, mixed-up sentence structure and poor grammatical construction.
People are born with dyslexia, but it is only when they begin to learn to write that it becomes a noticeable problem. For children with dyslexia, going to school can be a traumatic experience. Poor achievement can make them feel frustrated and insecure. They are reluctant to go to school and sometimes even skip school together, Cheating, stealing and experimenting with drugs can also occur when children regard themselves as failures.
It is a common misconception that dyslexic people are of inferior intelligence. Yet Albert Einstein, Leonardo da Vinci, Thomas Edison and Hans Christian Andersen were apparently all dyslexic. There is no total cure for dyslexia; however, the effects of dyslexia can be lessened with the guidance of skilled specialists and a lot of determination
The passage states that one common characteristic of dyslexics is that they___________
have difficulty expressing their feelings
are not able to read three-letter words
have difficulty learning the letter "b"
read words backwards
Read the following passage and mark the letter A, B, C, or Don your answer sheet to indicate the correct answer to each of the questions from 30 to 34
The term "dyslexia” is used to describe a number of problems associated with reading, writing or spelling. Short-term memory, mathematics, concentration, personal organization and sequencing may also be affected. We do not know exactly what causes dyslexia, but we do know that it tends to run in the family. We also know that more boys suffer from dyslexia than girls and that dyslexia is more common in urban areas than in rural.
One of the most common signs of dyslexia is “reversals”. People with this kind of problem often confuse letters like “b” and "a" when reading and writing or they sometimes read and write words like "tip" and "won" as “pit” and “now”. Other common characteristics are lack of punctuation, misspelling, mixed-up sentence structure and poor grammatical construction.
People are born with dyslexia, but it is only when they begin to learn to write that it becomes a noticeable problem. For children with dyslexia, going to school can be a traumatic experience. Poor achievement can make them feel frustrated and insecure. They are reluctant to go to school and sometimes even skip school together, Cheating, stealing and experimenting with drugs can also occur when children regard themselves as failures.
It is a common misconception that dyslexic people are of inferior intelligence. Yet Albert Einstein, Leonardo da Vinci, Thomas Edison and Hans Christian Andersen were apparently all dyslexic. There is no total cure for dyslexia; however, the effects of dyslexia can be lessened with the guidance of skilled specialists and a lot of determination
The purpose of this passage is to inform readers that___________
Albert Einstein was dyslexic
it is difficult for dyslexics to get professional help
dyslexics are as intelligent as other people
dyslexics are inferior to other people
Read the following passage and mark the letter A, B, C, or Don your answer sheet to indicate the correct answer to each of the questions from 30 to 34
The term "dyslexia” is used to describe a number of problems associated with reading, writing or spelling. Short-term memory, mathematics, concentration, personal organization and sequencing may also be affected. We do not know exactly what causes dyslexia, but we do know that it tends to run in the family. We also know that more boys suffer from dyslexia than girls and that dyslexia is more common in urban areas than in rural.
One of the most common signs of dyslexia is “reversals”. People with this kind of problem often confuse letters like “b” and "a" when reading and writing or they sometimes read and write words like "tip" and "won" as “pit” and “now”. Other common characteristics are lack of punctuation, misspelling, mixed-up sentence structure and poor grammatical construction.
People are born with dyslexia, but it is only when they begin to learn to write that it becomes a noticeable problem. For children with dyslexia, going to school can be a traumatic experience. Poor achievement can make them feel frustrated and insecure. They are reluctant to go to school and sometimes even skip school together, Cheating, stealing and experimenting with drugs can also occur when children regard themselves as failures.
It is a common misconception that dyslexic people are of inferior intelligence. Yet Albert Einstein, Leonardo da Vinci, Thomas Edison and Hans Christian Andersen were apparently all dyslexic. There is no total cure for dyslexia; however, the effects of dyslexia can be lessened with the guidance of skilled specialists and a lot of determination
Who is more likely to be dyslexic?
girls
children who live in the country
children who are not bright
children whose parents are dyslexic
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42
The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.
Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmicrays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn't seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.
Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.
However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased
What does the passage mainly explain?
Why hydrogen is abundant
When most of the helium in the universe was formed
How stars produce energy
The difference between helium and hydrogen
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42
The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.
Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmicrays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn't seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.
Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.
However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased
According to the passage, helium is ___________
the second-most abundant element in the universe
difficult to detect
the most prevalent element in quasars
the oldest element in the universe
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42
The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.
Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmicrays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn't seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.
Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.
However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased
The word "constituents” is closest in meaning to___________
relatives
components
causes
targets
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42
The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.
Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmicrays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn't seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.
Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.
However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased
Why does the author mention "cosmic rays"?
To explain how the universe began
To explain the abundance of hydrogen in the universe
As part of a list of things containing helium
As an example of an unsolved astronomical puzzle
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42
The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.
Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmicrays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn't seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.
Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.
However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased
The word “they” refers to___________
constituents
radiation
cosmic rays
particles
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42
The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.
Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmicrays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn't seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.
Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.
However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased
The word "vary" is closest in meaning to___________
change
include
stretch
mean
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42
The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.
Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmicrays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn't seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.
Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.
However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased
The creation of helium within stars___________
causes helium to be much more abundant in old stars than in young stars
produces hydrogen as a by-product
cannot be measured
produces energy
Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42
The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.
Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmicrays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn't seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.
Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.
However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased.
Most of the helium in the universe was formed___________
in a very short time
during the first minute of the universe's existence
in interstellar space
before most of the hydrogen
Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions
Although no H7N9 avian flu infections have reported in poultry or humans yet, the likelihood of outbreaks in Viet Nam is high
Although no
flue infections
have reported
is high
Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions
You shouldn't criticize him in front of his friends. It was insensitive of you
shouldn't criticize
in front of
It
insensitive
Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions
It is the recommendation of many psychologists that a learner ought to use mental images to associate words and remember them.
recommendation
ought to use
associate words
remember them
Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions
He is always arguing with his new classmate”. She said
She informed that he was always arguing with his new classmate
She said that he didn't like his new classmate
She explained that his new classmate was noisy
She complained that he was always arguing with his new classmate
Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions
Is anyone checking your essay about the environmental pollution?
Are you having someone to check your essay about the environmental pollution
Are you checking your essay about the environmental pollution?
Are you going to check your essay about the environmental pollution?
Are you having your essay about the environmental pollution checked?
Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions
A new book is twice as expensive as an old one
An old book is more cheaper than a new one
A new book is twice the price of an old one
An old book is as twice as the price of the new one
A new book is so far more expensive than an old one
Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions
We live abroad. It is important for us to create a balance between being open sociably and keeping our own values personally
We live abroad, it is important for us to create a balance between being open sociably and keeping our own values personally
The moment we will live abroad, it is important for us to create a balance between being open sociably and keeping your own values personally
When living abroad, it is important for us to create a balance between being open sociably and keeping our own values personally
Although we live abroad, it is important for us to create a balance between being open sociably and keeping your own values personally
Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions
The students may be intelligent. They will not get used to dealing with practical situations
The students may be too intelligent to get used to dealing with practical situations
Intelligent as they may be, the students will not get used to dealing with practical situations
Intelligent as may be the students, they will get used to dealing with practical situations
The students will get used to dealing with practical situations although they are intelligent
