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

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

出自：东华大学大学英语4

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