单选题：The“greenhouse effect”results from________．

题目分类：英语四级
题目类型：单选题
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题目内容：

The“greenhouse effect”results from________． A．the concentration of carbon dioxide in the air
B．the increasing particulate matter in the atmosphere
C．the burning of firewood
D．the blocking of sunlight

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分类：英语四级题型：单选题

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春天：夏天：秋天

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