UFO enthusiasts persist, however, and some persons even claim to have been captured and taken aboard UFOs. No one has produced scientifically acceptable proof of these claims. Behavioral scientist Carl Sagan once proposed that certain psychological needs are met by belief in superior beings from other worlds.

　　1. What is the significance of the UFO sighting in 1947 according to the passage?

　　A) It was the first evidence showing the existence of intelligent life outside Earth.

　　B) It helped to explain some sightings of unusual events occurring in the sky.

　　C) It aroused widespread interest in unidentified flying objects in the sky.

　　D) It started off a new era of flying saucers in the United States.

　　2. The second paragraph of the passage focuses on

　　A) some explanations about UFO sightings.

　　B) different kinds of UFOs reported.

　　C) peoples negative reaction to UFOs.

　　D) interesting claims made about UFOs.

　　3. According to the passage, which of the following about the UFO investigation by the U.S. Air Force is NOT true?

　　A) About 84 percent of the UFO reports received were explained.

　　B) UFOs were once regarded as a potential danger to national safety.

　　C) There was no evidence that the U.S. was being threatened by the reported UFOs.

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