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题目内容
（赤峰学院大学英语（专升本））
The atmosphere _______ certain gases mixed together in definite proportions.(本题3.0分)
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
