People use the word "unidentified" to describe the reported flying objects because what these objects are is still unknown. Acc

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问题 People use the word "unidentified" to describe the reported flying objects because what these objects are is still unknown.
According to the author many of the UFO reports are believable.

选项 A、Y
B、N
C、NG

答案A

解析 根据作者所说,"Some of the reports about them are difficult to believe."有些关于UFO的报道很难让人相信,但有一些是从科学的角度报道的,"Some have been explained in scientific ways.",因此又有一些可信度。
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