There are several theories as to why the dinosaurs become ______.A、extinctB、cre

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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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