The atmosphere ______ certain gases mixed together in definite proportion.A、cons

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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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