D) No hard evidence supported the existence of UFOs.
4. According to the passage, the belief that some UFOs are spaceships from some extraterrestrial civilizations
A) has been supported by a convincing UFO photograph.
B) would be accepted if it met the requirements of the scientific method.
C) has been regarded as some kind of creative thinking.
D) Has ruled out other explanations about the origin of UFOs.
5. Why did Carl Sagan think there are so many UFO enthusiasts?
A) The belief in UFOs gives them psychological satisfaction.
B) The explanation that UFOs are only conventional objects is not attractive.
C) They are strongly influenced by science fiction and science fiction films.
D) Curiously makes them accept the speculative explanations about UFOs.
Key: CCABA
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