25. In accordance with the paragraph, . . . .
A) an UFO is an unusual airborne object which cannot be identified
B) the UFO phenomenon entered the publics eye before 1800's
C) unknown flying objects were first observed by pilots during the second world war
D) there have been UFO sightings in nearly every country
26. Many researchers show the beginning of sightings in the United States in the later 1800s . . . .
A) although there has never been a clear evidence
B) and from time to time there is something called an UFO
C) which for a short time UFO sighting increase rapidly in one certain area
D) but nobody can explain anything about these sights
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