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 can still not 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 often use the word UFO when they are talking about alien spacecraft. Flying saucer is another word...
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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 can still not 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 often use the word UFO when they are talking about alien spacecraft. Flying saucer is another word that is often used to describe an unidentified flying object.
Studies estimate that 50%-90% of all reported UFO 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% UFOs are identified as one of three different things: astronomical causes (for example: planets, stars, or meteors); aircraft; balloons 10%-20% of UFOs are other causes (such as birds, clouds, mirages, searchlights, etc.)
1.What does the word “figure out” in paragraph 1 mean?
A. observe B. explain C. calculate D. require
2.Another word used to describe a UFO is.......
A.spacecraft B.astronaut C.flying saucer D.cooking oil
3.How many percents of all reported UFO sightings are not identified
A. 10%-20% B.20%-30% C.30%-50% D.80%-90%
4.Most of UFOs are identified as one of the following things except......
A.stars B.balloons C.clouds D.rains
5.Which of the following sentences is not true?
A.UFO means Unidentified Flying Object
B.UFO is often used to talk about alien spaceships
C.Many UFO sightings are hoaxes
D.Over half of all reportes UFO sighting are identified
1)UFO,which means flying saucer,is the abbreviation for Unidentified Flying Objecy.(identify)
2)95% of the atmosphere on Mars is carbon dioxide,which is poisonous to breathe(poison)
3)NASA has found out that Kepler-62e has some similarities to Earth(similar)
4)Do you think astronauts feel a great sense of loneliness when they travel alone in space?(lonely)
5)NASA scientists believe the existence of alien life is not far away from Earth(Exist)