The air ______ different gases _____ together.A.consist of, mixingB.is made up o
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The air ______ different gases _____ together.A.consist of, mixing | B.is made up of, mixed | C.consisting of, mixed | D.makes up, mixing |
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答案
B |
解析
试题分析:考查固定词组。固定词组consist of="be" made up of由…组成;consist of没有被动语态,没有进行时。本题第二空的gas与mix构成被动关系,故使用过去分词的形式mixed。句意:空气是有混合在一起的不同的气体组成的。故B正确。 点评:固定词组consist of="be" made up of由…组成;consist of没有被动语态,没有进行时。本题要注意分析句子结构,第一空所填的是句子的谓语动词,第二空的mixed together是修饰名词gases. |
举一反三
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