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

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选项
答案C
解析 本题的答案依据是文章的第三段，作者说Air pollution on underground trains tends to be less toxic than that at street level…，(地铁里的空气污染比地面交通毒性小……)后面是原因。所以乘坐地铁可以减少对有毒空气的暴露。
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