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15000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 76)
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15000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 76)

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Tiếng AnhLớp 125 lượt thi
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Đoạn văn

In the past, both men and women were expected to be married at quite young ages. Marriages were generally arranged by parents and family, with their children having little chance to say no in the matter. In the past, it was not surprising to find that a bride and groom had only just met on the day of their engagement or marriage.

In modern Vietnam, this has changed completely as people choose their own marriage-partners based on love, and in consideration primarily to their own needs and wants. Moreover early marriage is quite illegal.

The traditional Vietnamese wedding is one of the most important of traditional Vietnamese occasions. Regardless of westernization, many of the age-old customs practiced in a traditional Vietnamese wedding continue to be celebrated by both Vietnamese in Vietnam and overseas, often combining both western and eastern elements. Besides the wedding ceremony, there is also an engagement ceremony which takes place usually half a year or so before the wedding. The number of guests in attendance at these banquets is huge, usually in

the hundreds. Several special dishes are served. Guests are expected to bring gifts, often money, which the groom and bride at one point in the banquet will go from table to table collecting.

1. Trắc nghiệm
1 điểm

In the past, _________.

Vietnamese couples were free to make a decision on the marriage

Vietnamese marriage was decided by parents and family

getting married at an early age was not allowed

parents had no right to interfere their children's marriage

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2. Trắc nghiệm
1 điểm

In former days, the fact that a bride and groom had only first met just on the day of their engagement or marriage was _________.

surprising

popular

uncommon

strange

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3. Trắc nghiệm
1 điểm

Which sentence is referred Vietnamese modern marriage?

Most young people do not have their marriage based on love.

All marriages are arranged by parents and family.

Marriage is quite westernization.

Couples do not get married at quite young ages.

Xem đáp án
4. Trắc nghiệm
1 điểm

According to the passage, __________.

Oversea Vietnamese people do not like to organize a traditional wedding

There is an engagement ceremony which takes place usually half a year or so before the wedding

Many of the age-old customs practiced in a traditional Vietnamese wedding do not exist nowadays

Vietnamese people never ask a fortune teller the date and time of the marriage ceremony

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5. Trắc nghiệm
1 điểm

Which does not exist in a Vietnamese wedding party?

dishes

firecrackers

guests

gifts

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Đoạn văn

Herman Melville, an American author best known today for his novel Moby Dick, was actually more popular during his lifetime for some of his other works. He traveled extensively and used the knowledge gained during his travels as the basis for his early novels. In 1837, at the age of eighteen, Melville signed as a cabin boy on a merchant ship that was to sail from his Massachusetts home to Liverpool, England. His experiences on this trip served as a basis for the novel Redburn (1849). In 1841 Melville set out on a whaling ship headed for the South Seas. After jumping ship in Tahiti, he wandered around the islands of Tahiti and Moorea. This South Sea island sojourn was a backdrop to the novel Omoo (1847). After three years away from home, Melville joined up with a U.S. naval frigate that was returning to the eastern United States around Cape Horn. The novel White-Jacket (1850) describes this lengthy voyage as a navy seaman.

With the publication of these early adventure novels, Melville developed a strong and loyal following among readers eager for his tales of exotic places and situations. However, in 1851, with the publication of Moby Dick, Melville's popularity started to diminish. Moby Dick, on one level the saga of the hunt for the great white whale, was also a heavily symbolic allegory of the heroic struggle of man against the universe. The public was not ready for Melville's literary metamorphosis from romantic adventure to philosophical symbolism. It is ironic that the novel that served to diminish Melville's popularity during his lifetime is the one for which he is best known today.

6. Trắc nghiệm
1 điểm

The main subject of the passage is_________.

A Melville’s travels

Moby Dick

Melville’s personal background

the popularity of Melville’s novels

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7. Trắc nghiệm
1 điểm

The word “basis” in paragraph 1 is closest in meaning to_________.

A background

message

bottom

dissertation

Xem đáp án
8. Trắc nghiệm
1 điểm

According to the passage, Melville’s early novels were__________.

A published while he was traveling

completely fictional

all about his work on whaling ships

based on his travel experience

Xem đáp án
9. Trắc nghiệm
1 điểm

The passage implies that Melville stayed in Tahiti because____________.

A he had unofficially left his ship

he was on leave while his ship was in port

he had finished his term of duty

he had received permission to take a vacation in Tahiti

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10. Trắc nghiệm
1 điểm

How did the publication of Moby Dick affect Melville’s popularity?'

A His popularity remained as strong as ever.

It caused his popularity to decrease.

His popularity increased immediately.

It had no effect on his popularity.

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11. Trắc nghiệm
1 điểm

According to the passage, Moby Dick is__________.'

A symbolic of humanity fighting the universe

a single-faceted work

a short story about a whale

a 47 adventure

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12. Trắc nghiệm
1 điểm

In what year did Melville’s book about his experiences as a cabin boy appear?

A 1849

1837

1847

1841

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13. Trắc nghiệm
1 điểm

The word “metamorphosis” in paragraph 2 is closest in meaning to_________.

A descent  

circle

mysticism

change

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Đoạn văn

The handling and delivery of mail has always been a serious business, underpinned by the trust of the public in requiring timeliness, safety, and confidentiality. After early beginnings using horseback and stagecoach, and although cars and trucks later replaced stagecoaches and wagons, the Railway Mail Service still stands as one of America’s most resourceful and exciting postal innovations. This service began in 1832, but grew slowly until the Civil War. Then from 1862, by sorting the mail on board moving trains, the Post Office Department was able to decentralize its operations as railroads began to crisscross the nation on a regular basis, and speed up mail delivery. This service lasted until 1974. During peak decades of service, railway mail clerks handled 93% of all non-local mail and by 1905 the service had over 12,000 employees.

Railway Post Office trains used a system of mail cranes to exchange mail at stations without stopping. As a train approached the crane, a clerk prepared the catcher arm which would then snatch the incoming mailbag in the blink of an eye. The clerk then booted out the outgoing mailbag. Experienced clerks were considered the elite of the Postal Service’s employees, and spoke with pride of making the switch at night with nothing but the curves and feel of the track to warn them of an upcoming catch. They also worked under the greatest pressure and their jobs were considered to be exhausting and dangerous. In addition to regular demands of their jobs they could find themselves the victims of train wrecks and robberies.

As successful as it was, “mail-on-the-fly” still had its share of glitches. If they hoisted the train’s catcher arm too soon, they risked hitting switch targets, telegraph poles or semaphores, which would rip the catcher arm off the train. Too late, and they would miss an exchange.

14. Trắc nghiệm
1 điểm

Which of the following can be inferred from the first paragraph?

A There was a high turnover of railway mail clerks.

The development of the mail roads during the second half of the 19thcentury enabled Post Office Department to focus on timeliness.

The Post Office Department was more concerned about speeding up mail delivery than the safety of its clerks.

Mail was often lost or damaged as it was exchanged on the mail crane.

Xem đáp án
15. Trắc nghiệm
1 điểm

The word “elite” in the second paragraph is closest in meaning to___________.

A majority

superior

more capable

leader

Xem đáp án
16. Trắc nghiệm
1 điểm

What does the passage mainly discuss?

How the mail cranes exchanged the mail.

Improvements in mail handling and delivery.

How Post Office Trains handled the mail without stopping.

The skills of experienced clerks.

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17. Trắc nghiệm
1 điểm

According to the passage, the Railway Mail Service commenced in_________. 

A 1874

1842

1832

1905

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18. Trắc nghiệm
1 điểm

The word “glitches” in the third paragraph can be replaced by________. 

A accidents

blames

advantages

problems

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19. Trắc nghiệm
1 điểm

Which of the following is TRUE according to the passage? 

A The clerk booted out the outgoing mailbag before snatching the incoming bag.

Clerks couldn’t often see what they were doing.

The Railway Mail clerk’s job was considered elite because it was safe and exciting.

Despite their success, railway mail clerks only handled a small proportion of all non-local mail.

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20. Trắc nghiệm
1 điểm

The public expects the following three services in handling and delivery of mail except___________. 

A safety

accuracy

confidentiality

timeliness

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Đoạn văn

Sunlight is solar energy. Sunlight is needed for growing plants that you eat to get energy. Sunlight is also used to make clean electricity. Burning fossil fuels to make electricity pollutes our atmosphere and rivers. Fossil fuels are expensive and limited sources of energy. Nuclear fission is used to create enormous amount of heat and electricity. However, nuclear fission forms dangerous radioactive waste.

Sunlight offers many ways to get energy. A window can allow warm sunlight into your room. Solar water-heating systems can use sunlight to warm the water for your home, swimming pool and school. Sunlight also warms the Earth and causes wind. Electricity can be made by wind generators.

Photovoltaic, or PV system use a type of material that converts sunlight into electricity. PV systems can power your air conditioner or a satellite like the International Space Station. PV systems are also used to run a calculator, recharge cell phone, or even power lightweight cars.

Sunlight is also changed into electricity by concentrating solar power or CSP systems. CSP systems have mirrors that focus the sunlight. The concentrated sunlight turns water into steam which turns a turbine that is connected to an electric generator. A CSP system usually uses sunlight to make steam. CSP power plants can store large amount of heat. The stored heat is used to make electricity at night. During cloud days, many CSP plants can also burn natural gas to provide the heat that is used to turn water into steam.

Sunlight provides the energy needed to grow plants and make large amount of environmentally friendly heat and electricity. Solar energy can provide power today and for a long time in the future.

21. Trắc nghiệm
1 điểm

This article is mainly about ______

Human using sunlight to stay warm.

The need to develop new technology for solar power system.

How the energy of sunlight is used.

How solar energy can provide power for transportation systems.

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22. Trắc nghiệm
1 điểm

In the first paragraph, the word “fossil fuels” in line 2 means ________

fuels formed millions of years from the remains of animals and plants

nuclear energy

solar power

fuel formed from the energy of the wind

Xem đáp án
23. Trắc nghiệm
1 điểm

The drawback of nuclear fission is that ________

it sends out energy in the form of rays that can be harmful.

it is costly.

it releases smoke.

it is time-consuming to be formed.

Xem đáp án
24. Trắc nghiệm
1 điểm

To help the readers understand some of the benefits of solar energy, the author ________

provides a list of solar energy projects.

lists in chronological order the invention of various systems that gather the energy of sunlight.

describes in detail how a PV system works.

briefly compares and contrasts the differences in using fossil fuels, nuclear fission and solar energy in electric power systems

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25. Trắc nghiệm
1 điểm

Which of the following statements is NOT true?

Fossil fuel supplies are unlimited.

Solar energy is the energy that comes from the sun.

PV systems provide electricity for the International Space Station.

A CSP power plant can produce steam even at night.

Xem đáp án
26. Trắc nghiệm
1 điểm

In the third paragraph, the word “convert” is closest in meaning to _______

change form one religion to another

transform

exchange for something equal in value

converse

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27. Trắc nghiệm
1 điểm

In the fourth paragraph, the word “which” refers to _______

water

steam

sunlight

solar power

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Đoạn văn

In most discussions of cultural diversity, attention has focused on visible, explicit aspects of culture, such as language, dress, food, religion, music, and social rituals. Although they are important, these visible expressions of culture, which are taught deliberately and learned consciously, are only the tip of the iceberg of culture. Much of culture is taught and learned implicitly, or outside awareness. Thus, neither cultural insiders nor cultural outsiders are aware that certain “invisible” aspects of their culture exist.

Invisible elements of culture are important to us. For example, how long we can be late before being impolite, what topics we should avoid in a conversation, how we show interest or attention through listening behaviour, what we consider beautiful or ugly- these are all aspects of culture that we learn and use without being aware of it. When we meet other people whose invisible cultural assumptions differ from those we have learned implicitly, we usually do not recognize their behaviour as cultural in origin.

Differences in invisible culture can cause problems in cross-cultural relations. Conflicts may arise when we are unable to recognize others’ behavioural differences as cultural rather than personal. We tend to misinterpret other people’s behaviour, blame them, or judge their intentions or competence without realizing that we are experiencing cultural rather than individual differences.

Formal organizations and institutions, such as schools, hospitals, workplaces, governments, and the legal system are collection sites for invisible cultural differences. If the differences were more visible, we might have less misunderstanding. For example, if we met a man in a courthouse who was wearing exotic clothes, speaking a language other than ours, and carrying food that looked strange, we would not assume that we understood his thoughts and feelings or that he understood ours. Yet when such a man is dressed similarly to us, speaks our language, and does not differ from us in other obvious ways, we may fail to recognize the invisible cultural differences between us. As a result, mutual misunderstanding may arise.

28. Trắc nghiệm
1 điểm

What is the main purpose of the passage?

To point out that much of culture is learned consciously.

To describe cultural diversity.

To explain the importance of invisible aspects of culture.

To explain why cross-cultural conflict occurs.

Xem đáp án
29. Trắc nghiệm
1 điểm

The word “deliberately” in bold in paragraph 1 is closest in meaning to _______.

slowly

accurately

intentionally

randomly

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30. Trắc nghiệm
1 điểm

The phrase “the tip of the iceberg” in paragraph 1 means that ___________.

most aspects of culture cannot be seen

we usually focus on the highest forms of culture

other cultures seem cold to us

visible aspects of culture are learned in formal institutions

Xem đáp án
31. Trắc nghiệm
1 điểm

Which of the following was NOT mentioned as an example of invisible culture?

How people express interest in what others are saying

How late is considered impolite

What topics to avoid in conversation

What food to eat in a courthouse

Xem đáp án
32. Trắc nghiệm
1 điểm

The word “those” in paragraph 2 refers to__________.

invisible cultural assumptions

people from a different culture

topics that should be avoided in conversation

people who speak a different language

Xem đáp án
33. Trắc nghiệm
1 điểm

It can be inferred from paragraph 3 that conflict results when ___________.

one culture is more invisible than another culture

people compete with those from other cultures

some people recognize more cultural differences than others

people think cultural differences are personal

Xem đáp án
34. Trắc nghiệm
1 điểm

The author implies that institutions such as schools and workplaces ________.

reinforce invisible cultural differences

are aware of cultural differences

share a common culture

teach their employees about cultural differences

Xem đáp án
35. Trắc nghiệm
1 điểm

Which of the following would most likely result in misunderstanding?

Strange behaviour from someone speaking a foreign language

Learning about our own culture in school

Strange behaviour from someone speaking our language

Unusual food being cooked by foreign visitors

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Đoạn văn

Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.

Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.

The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space. The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.

36. Trắc nghiệm
1 điểm

What does the passage mainly discuss?

The mass migration of ants

How ants mark and follow a chemical trail

Different species of ants around the world

The information contained in pheromones

Xem đáp án
37. Trắc nghiệm
1 điểm

The word “intermittently” in live 4 is closest in meaning to

A periodically  

incorrectly

rapidly

roughly

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38. Trắc nghiệm
1 điểm

The phrase “the one” in line 8 refers to a single

A message  

dead ant

food trail

species

Xem đáp án
39. Trắc nghiệm
1 điểm

According to the passage, why do ants use different compounds as trail pheromones?

A To reduce their sensitivity to some chemicals

To attract different types of ants

To protect their trail from other species

To indicate how far away the food is

Xem đáp án
40. Trắc nghiệm
1 điểm

The author mentions the trail pheromone of the leafcutter ant in line 11 to point out

A how little pheromone is needed to mark a trail

the different types of pheromones ants can produce

a type of ant that is common in many parts of the world

that certain ants can produce up to one milligram of pheromone

Xem đáp án
41. Trắc nghiệm
1 điểm

According to the passage, how are ants guided by trail pheromones?

A They concentrate on the smell of food.

They follow an ant who is familiar with the trail.

They avoid the vapor spaces by moving in a straight line.

They sense the vapor through their antennae.

Xem đáp án
42. Trắc nghiệm
1 điểm

The word “oscillating“ in line 17 is closest in meaning to

A falling

depositing

swinging

starting

Xem đáp án
43. Trắc nghiệm
1 điểm

According to the passage, the highest amount of pheromone vapor is found

A in the receptors of the ants

just above the trail

in the source of food

under the soil along the trail

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Đoạn văn

Martin Luther King, Jf., is well- known for his work in civil rights and for his many famous speeches, among which is his moving “ I have a dream” speech. But fewer people know much about King’s childhood. M.L., as he was called, was born in 1929 in Atlanta, Georgia, at the home of his maternal grandfather. M.L.’s grandfather purchased their home on Auburn Avenue in 1909, twenty years before M.L was born. His grandfather allowed the house to be used as a meeting place for a number of organizations dedicated to the education and social advancement of blacks. M.L. grew up in the atmosphere, with his home being used as a community gathering place, and was no doubt influenced by it.

M.L.’s childhood was not especially eventfully. His father was a minister and his mother was a musician. He was the second of three children, and he attended all black schools in a black neighborhood. The neighborhood was not poor, however. Auburn Avenue was an area of banks, insurance companies, builders, jewelers, tailors, doctors, lawyers, and other businesses and services. Even in the face of Atlanta’s segregation, the district thrived. Dr. King never forgot the community spirit he had known as a child, nor did he forget the racial prejudice that was a huge barrier keeping black Atlantans from mingling with whites.

44. Trắc nghiệm
1 điểm

What is the passage mainly about?

A The prejudice that existed in Atlanta.

M.L.’s grandfather

Martin Luther King’s childhood.

The neighborhood King grew up in

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45. Trắc nghiệm
1 điểm

When was M.L. born?

A in 1909

in 1929

in 1949

20 years after his parents had met.

Xem đáp án
46. Trắc nghiệm
1 điểm

What is Martin Luthur King well- known for?

A His publications.

His neighborhood.

His childhood.

His work in civil rights.

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47. Trắc nghiệm
1 điểm

According to the author, M.L. _______.

A had a difficult childhood.

was a good musician as a child

loved to listen to his grandfather speak.

grew up in a relatively rich area of Atlanta.

Xem đáp án
48. Trắc nghiệm
1 điểm

Which of the following statements is NOT true?

A Auburn was a commercial areas.

M.L.’s grandfather built their home on Auburn Avenue in 1909.

M. L. grew up in a rich, black neighborhood.

M.L.’s childhood was uneventful.

Xem đáp án
49. Trắc nghiệm
1 điểm

From the passage we can infer that:

A M.L.’s father was a church member.

people gathered at M.L.’s to perform religious rituals.

M.L.’s father purchased their home on Auburn Avenue.

M.L. had a bitter childhood.

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50. Trắc nghiệm
1 điểm

M.L. was _______ by the atmosphere in which he grew up.

A not affected at all

doubted

certainly influenced

prejudiced

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Đoạn văn

A pioneering study by Donald Appleyard made the astounding discovery that a sudden increase in the volume of traffic through an area affects people in the way that a sudden increase in crime does. Appleyard observed this by finding three blocks of houses in San Francisco that looked much alike and had the same kind of middle-class and working-class residents, with approximately the same ethnic mix. The difference was that only 2,000 cars a day ran down Octavia Street (LIGHT street, in Appleyard’s terminology) while Gough Street (MEDIUM street) was used by 8,000 cars daily, and Franklin Street (HEAVY street) had around 16,000 cars a day. Franklin Street often had as many cars in an hour as Octavia had in a day.
          Heavy traffic brought with it danger, noise, fumes and soot, directly, and trash secondarily. That is, the cars didn’t bring in much trash, but when trash accumulated, residents seldom picked it up. The cars, Appleyard determined, reduced the amount of territory residents felt responsible for. Noise was a constant intrusion into their homes. Many Franklin Street residents covered their doors and windows and spent most of their time in the rear of their houses. Most families with children had already left.
          Conditions on Octavia Street were much different. Residents picked up trash. They sat on their front steps and chatted with neighbors. They had three times as many friends and twice as many acquaintances as the people on Franklin.
          On Gough Street, residents said that the old feeling of community was disappearing as traffic increased. People were becoming more and more preoccupied with their own lives. A number of families had recently moved and more were considering. Those who were staying expressed deep regret at the destruction of their community.

51. Trắc nghiệm
1 điểm

The word “astounding” in line 1 is closest in meaning to

startling

disappointing

dubious

alternative

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52. Trắc nghiệm
1 điểm

The three streets mentioned in this passage are different in that __________.

they are in different cities

the residents are of different ethnic backgrounds.

they have varying amounts of traffic.

the income levels of the residents vary considerably.

Xem đáp án
53. Trắc nghiệm
1 điểm

Approximately how many cars used Franklin Street daily?

2,000

8,000

16,000

20,000

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54. Trắc nghiệm
1 điểm

All of the following are direct results of heavy traffic EXCEPT

increased amount of trash

greater danger to residents

more pollution

more vibrations

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55. Trắc nghiệm
1 điểm

The author’s main purpose in the second paragraph is to __________.

discuss the problem of trash disposal

point out the disadvantage of heavy traffic

propose an alternate system of transportation

suggest ways to cope with traffic problems

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56. Trắc nghiệm
1 điểm

Which of the following is NOT a statement you would expect from a resident of Gough Street?

People on this street are unhappy because the neighborhood is deteriorating.

People on this street think mostly of themselves.

People on this street have more and more space for which they feel responsible.

A number of people are preparing to leave this street.

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57. Trắc nghiệm
1 điểm

In what order does the author present detailed discussions of the three streets?

LIGHT, MEDIUM, HEAVY

HEAVY, MEDIUM, LIGHT

HEAVY, LIGHT, MEDIUM

LIGHT, HEAVY, MEDIUM

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58. Trắc nghiệm
1 điểm

What is the writer’s attitude toward heavy traffic when he mentions the Appleyard’s study?

neutral

favorable

critical

doubtful

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Đoạn văn

Dinosaurs were reptiles that lived during a period of earth’s history called the Mesozoic Era, which is known as the Age of Reptiles. The first dinosaurs appeared more than 200 million years ago. For many millions of years, they dominated the land with their huge size and strength. Then about 65 million years ago, they died out rather suddenly, never to reemerge.
          The word dinosaur comes from two Greek words meaning “terrible lizard”. Dinosaurs were not lizards, but their appearance could be truly terrifying. The biggest ones weighed more than ten times as much as a mature elephant and nearly equaled the size of most modern—day whales. The famous kinds of dinosaurs, including the brontosaur and tyrannosaurus, reached 80 to 90 feet in length. Not all dinosaurs were giants, however, some were actually no larger than a chicken.
          Scientists still do not know what caused dinosaur to disappear. One theory involves a change in the earth’s climate. It is believed that temperature dropped significantly towards the end of the Cretaceous Period. Too large to hibernate and not having fur or feathers for protection, it is possible that the climate became too chilly for dinosaurs. In contrast, other species having protection, such as the mammals and birds, were able to survive

59. Trắc nghiệm
1 điểm

The word “ones” in the passage refers to __________

dinosaurs

millions

lizards

whales

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60. Trắc nghiệm
1 điểm

The word “chilly” in the passage refers to _________

very hot

extremely cold

very cold

humid

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61. Trắc nghiệm
1 điểm

What is the best title for this passage?

The Domination of the Land

The Metabolism of Dinosaurs

Earth’s Largest Reptiles

The History of Earth

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62. Trắc nghiệm
1 điểm

It can be inferred from the passage that the Age of Reptiles lasted about ______

200 million years

135 million years

80 million years

65 million years

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63. Trắc nghiệm
1 điểm

The author uses the phrase “never to reemerge” to indicate the dinosaurs

became extinct

went into hiding

never died out

lost their way

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64. Trắc nghiệm
1 điểm

According to the passage, what is true about the size of dinosaurs?

It made them the largest creatures ever on earth.

It varied quite greatly.

It guaranteed their survival.

It was rather uniform.

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65. Trắc nghiệm
1 điểm

Which of the following can be inferred about mammals and birds?

Most have either fur or feathers over their bodies.

They preceded the dinosaurs.

They were too large to hibernate.

They could not survive the chilly temperatures.

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Đoạn văn

The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid removes minerals from tooth enamel, allowing tooth decay to begin; the saliva in your mouth encourages remineralization and neutralizes the acid. The rate at which bacteria in the mouth produce acid depends on the amount of plaque on the teeth, the composition of the microbial flora, and whether the bacteria of the plaque have been "primed" by frequent exposure to sugar. To keep your teeth healthy, a regular dental hygiene program should be followed.
Removing plaque with a toothbrush and dental floss temporarily reduces the numbers of bacteria in the mouth and thus reduces tooth decay. It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions. If fluoride is present in drinking water when teeth are forming, some fluoride is incorporated into the enamel of the teeth, making them more resistant to attack by acid. Fluoride toothpaste seems to act in another way, by promoting the remineralization of early carious lesions.
In addition to a regular dental hygiene program, a good way to keep your teeth healthy is to reduce your intake of sweet food. The least cavity-causing way to eat sweets is to have them with meals and not between. The number of times you eat sweets rather than the total amount determines how much harmful acid the bacteria in your saliva produce. But the amount of sweets influences the quality of your saliva. Avoid, if you can, sticky sweets that stay in your mouth a long time. Also try to brush and floss your teeth after eating sugary foods. Even rinsing your mouth with water is effective. Whenever possible, eat foods with fiber, such as raw carrot sticks, apples, celery sticks, etc., that scrape off plaque, acting as a toothbrush. Cavities can be greatly reduced if these rules are followed when eating sweets.

66. Trắc nghiệm
1 điểm

What does this passage mainly discuss?

Good nutrition

Food with fiber

Ways to keep your teeth healthy

Fluoridization and cavities

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67. Trắc nghiệm
1 điểm

The word “it” refers to ___________.

dental floss

bacteria

removal of plaque

plaque

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68. Trắc nghiệm
1 điểm

According to the passage, all of the following statements about plaque are true EXCEPT ___________.

It consists of acid producing bacteria

It is not affected by eating sweets

It can be removed from teeth by brushing and flossing

It reduces the positive effect of saliva

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69. Trắc nghiệm
1 điểm

We can infer from the passage that one benefit of fluoride to healthy teeth is __________.

It strengthens tooth enamel

It stimulates saliva production

It makes teeth whiter

It is a replacement for brushing and flossing in dental care

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70. Trắc nghiệm
1 điểm

What can be concluded from the passage about sweets?

All sweets should be avoided.

Sweets should be eaten with care.

It is better to eat sweets a little at a time throughout the day.

Sticky sweets are less harmful than other sweets.

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71. Trắc nghiệm
1 điểm

The author of the passage states that the amount of acid produced by the bacteria in your saliva increases __________.

with the amount of sweets you eat

with the number of times you eat sweets

if you eat sweets with your meals

if you eat sticky sweets

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72. Trắc nghiệm
1 điểm

The word "scrape off" is closest in meaning to

repel

rub together with

remove

dissolve

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