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

試題分析：句意：--氣候變化主要由于空氣中的二氧化碳太多而引起的。--因此我認(rèn)為關(guān)鍵是通過(guò)不排放二氧化碳的情況下發(fā)電。這里句子的主語(yǔ)Climate change與cause之間是被動(dòng)關(guān)系，故選A。
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