题目内容：
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。
参考答案：
选择题：122. The atmosphere certain gases mixed toget
- 题目分类：东华大学大学英语4
- 题目类型：选择题
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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。