一Climate change________mainly by too much CO 2 in the air．一So I think the key is
题型：不详难度：来源：
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。 |
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