) The atmosphere ______ certain gases mixed together in definite proportions. A) composes of B) is made up C) consists of D) makes up of

)

The atmosphere ______ certain gases mixed together in definite proportions.

A)
composes of

B)
is made up

C)
consists of

D)
makes up of

出自：中国石油大学- 《大学英语3》

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