The air ______ different gases _____ together.
A．consist of, mixingB．is made up of, mixed
C．consisting of, mixedD．makes up, mixing
B

試題分析：考查固定詞組。固定詞組consist of="be" made up of由…組成；consist of沒有被動語態(tài)，沒有進行時。本題第二空的gas與mix構成被動關系，故使用過去分詞的形式mixed。句意：空氣是有混合在一起的不同的氣體組成的。故B正確。
點評：固定詞組consist of="be" made up of由…組成；consist of沒有被動語態(tài)，沒有進行時。本題要注意分析句子結構，第一空所填的是句子的謂語動詞，第二空的mixed together是修飾名詞gases.
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