问题
单项选择题
The atmosphere（）certain gases mixed together in definite proportions.
A.composes of
B.is made up
C.consists of
D.makes up of
答案
参考答案：C
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The atmosphere（）certain gases mixed together in definite proportions.
A.composes of
B.is made up
C.consists of
D.makes up of
参考答案：C