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题目
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一Climate change________mainly by too much CO 2 in the air.
一So I think the key is to produce electricity without creating CO2
A.is caused    B.caused         C.causes
答案
A
解析

试题分析:句意:--气候变化主要由于空气中的二氧化碳太多而引起的。--因此我认为关键是通过不排放二氧化碳的情况下发电。这里句子的主语Climate change与cause之间是被动关系,故选A。
核心考点
试题【一Climate change________mainly by too much CO 2 in the air.一So I think the key is】;主要考察你对动词的被动语态等知识点的理解。[详细]
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