2. 外语
  3. 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

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

*
选项
答案E
解析 第五段讲的是不同的时间段对污染强度的影响。作者讲到了几种情况：交通高峰时段污染会突然增加，晚间污染程度会降低，一年四季中，春秋季污染程度要低于炎热的夏季和严寒的冬季。所以本段的标题应该是：When pollution levels rise and fall。
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