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【单选题】
Oneofthemainreasonsforairpollutionisthatmanycars（）smokeintotheatmosphere.
A.gather
B.hire
C.discharge
D.escape
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参考答案：
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根据网考网移动考试中心的统计，该试题：
0%
的考友选择了A选项
28%
的考友选择了B选项
65%
的考友选择了C选项
7%
的考友选择了D选项
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