The atmosphere ______ certain gases mixed together in definite proportion.

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问题 The atmosphere ______ certain gases mixed together in definite proportion.

选项 A、consists of
B、consists in
C、insists on
D、persists in

答案A

解析本题考查动词短语辨析。选择中，consist of=be made up of或be composed of由…组成；consist in=lie in在于；insist on=persist in：坚持，执意。本句的意思为：“大气层由多种气体混合组成，它们各占一定比率”。故A符合题意。

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大学英语四级

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