A. Where you stand while waiting to cross a road B. Where you walk C. Where you sit on a bus and how you travel D. When you go t

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问题 A. Where you stand while waiting to cross a road
B. Where you walk
C. Where you sit on a bus and how you travel
D. When you go to bed
E. When pollution levels rise and fall
F. When you get up

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选项

答案A

解析 文章最后一段的第十句话是There are large sudden pollution increases during rush hours(高峰期间污染会突然大幅增加)。而在第二段,作者开门见山就说: Avoid walking in busy streets。在第三段的最后,作者解释了地面交通污染的起因: diesel and petrol fumes have a mixture of pollutants。综合以上所提到的几个方面,是可见It’s wise to stay away from heavy traffic during rush hours(高峰时段避开繁忙的交通实为明智之举)。
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