40. A. light B. fire C. fuel D. food
VI. read the passage below and choose one correct answer for each question.
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. *)%-90% UFOs are identified as one of three different things:
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