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题目内容
（广东开放大学大英B（本22秋））
The atmosphere ______ certain gases mixed together in definite proportions.
选择一项：
A. composes of
B. is made up
C. consists of
D. makes up of
选择一项：
A. composes of
B. is made up
C. consists of
D. makes up of
参考答案
