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  3. The atmosphere_____certain gases mixed together in definite proportions.A. compo

The atmosphere_____certain gases mixed together in definite proportions.A. compo

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问题 The atmosphere_____certain gases mixed together in definite proportions.
选项 A. composes of
B. is made up
C. consists of
D. makes up of
答案C
解析大气是由多种气体以一定的比例混合而成的。
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