----- Nội dung dịch tự động từ ảnh -----
A,
or D that best answers the question about the passage.
A UFO (Unidentified Flying Object) is any object flying in the sky which cannot be
identified by the person who sees it. Sometimes the object is investigated. If people cannot
figure out what the object is after an investigation, it is called a UFO. If they figure out what
the object is, it can no longer be called a UFO because it has been identified.
Even though UFOs can be anything, people can use the world UFO when they are talking
about alien spacecraft. Flying saucer is another word that is often used to describe an identified
flying object.
Studies estimate that 50-90% of all reported sightings are identified later. Usually 10-20%
are never identified. Studies also show that very few UFO sightings are hoaxes (people trying
to trick other people). Most UFOs are actually natural or man-made objects that looked strange.
80-90% of UFOs are identified as one of three different things: (a) astronomical causes (for
example: planets, stars, or meteors); (b) aircraft; and (c) balloons. 10-20% of UFOs are other
causes, such as birds, clouds, mirages, searchlights, etc.
36. Another word used to describe a UFO is
A. flying saucer
B. cooking plane C. spacecraft
37. How many percent of all reported sights are not identified?
A. 20-30%
B. 10-20%
C. 30-50%
D. 80-90%
38. Most of UFOs are identified as one of the following things except
A. balloons
B. clouds
C. stars
D. rains
39. Which of the following sentences is NOT true?
A. UFO means Unidentified Flying Object.
B. Many UFO sightings are hoaxes.
C. UFO is often used to talk about alien objects.
D. Over half of all reported UFO sightings are identified.
40. What does the word "figure out" in paragraph 1 mean?
A. calculate
B. observe
C. explain
D. astronaut
D. require