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【单选题】

What is the main topic of the conversation

A、The development of the automobile.
B.Declining air quality.
C.The structure of nitrous oxides.
D.Air quality management.
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根据网考网移动考试中心的统计,该试题:

11%的考友选择了A选项

77%的考友选择了B选项

5%的考友选择了C选项

7%的考友选择了D选项

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