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 第四段讲的是在等过马路时站在哪里最为合适,所以应选A,Where you stand while waiting to cross a road。
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