2. 外语
  3. There are several theories as to why the dinosaurs become ______.

There are several theories as to why the dinosaurs become ______.

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问题 There are several theories as to why the dinosaurs become ______.
选项 A、extinct
B、credible
C、distinct
D、esthetic
答案A
解析 形容词辨义。这四个选项都是形容词，extinct表示“熄灭的，灭绝的，耗尽的”；credible表示“可信的；可靠的”；distinct意指“(常与from连用)不同的；分别的；独特的”，如：Keep the two ideas distinct．(将这两个观念分开来。)esthetic表示“感觉的”。根据句意，恐龙是一种已经灭绝的动物，所以A)项符合。
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大学英语六级

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