题目内容：
最重要的温室气体是二氧化碳，其对温室效应的作用（ ）A．100%以上
B．80%以上
C．50%以上
D．20%以上
参考答案：
选择题：最重要的温室气体是二氧化碳,其对温室效应的作用( )A.100%以上 B.80%以上 C.50%以上
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