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题目内容
（郑州工程技术学院-大学英语1）
The atmosphere _______ certain gases mixed together in definite proportions.
(A)composes of
(B)is made up
(C)consists of
(D)makes up of
(A)composes of
(B)is made up
(C)consists of
(D)makes up of
参考答案
