20 câu hỏi
What does the passage mainly discuss?
Days on Mercury
What Mercury is like
Sunrise on Mercury
Length of a year on Mercury
According to the passage, Mercury _____________.
is the nearest to the Sun
doesn't have atmosphere
the hottest planet
has many moons
The word "It" in paragraph 2 refers to _____________.
Earth
Mercury
Venus
Mars
The word "spins" in paragraph 3 can be best replaced by _____________.
comes
arrives
appears
moves
It can be inferred from the passage that a year on Mercury _____________.
has 59 days
much longer than that on Earth
has 88 days
has only 180 days
How often does the sun rise on Mercury?
The same as on Earth.
Every 3 months.
Every 180 days.
Sun never sets.
All of the UFO sightings were later identified as ordinary objects like planes, satellites, etc.
True
False
People also call UFOs of any shape flying saucers.
True
False
The Air Force took the reports of UFO sightings seriously because they believed in visitors from outer space.
True
False
Project Blue Book was one of the Air Force's programs.
True
False
The Air Force concluded that UFOs were not a threat to the US.
True
False
UFOs are always proven to be alien spaceships.
True
False
Modern UFO sightings started in the mid-20th century.
True
False
Flying saucers only refer to round-shaped UFOs.
True
False
The Air Force created Project Blue Book to study UFOs.
True
False
Scientists haven't done much research to find life forms on other planets.
True
False
Earth's temperate atmosphere makes it accommodative to life forms.
True
False
Earth's distance from the Sun allows it to receive just enough heat.
True
False
No other planets have any of Earth's life-sustaining features.
True
False
Earth is still the only planet with all necessary conditions for life.
True
False