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一Climate change________mainly by too muc...

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

 

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。 考点:考查被动语态。  
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