2. 外语
  3. The atmosphere ______ certain gases mixed together in definite proportion.

The atmosphere ______ certain gases mixed together in definite proportion.

admin2012-03-02  38
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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