Questions 1-6 Choose the appropriate letters A-D and write them in boxes 1-6 on your answer sheet. *

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问题 Questions 1-6
Choose the appropriate letters A-D and write them in boxes 1-6 on your answer sheet.

*

选项 A、people should avoid working in cities.
B、Americans spend too little time outdoors.
C、hazardous gases are concentrated in industrial suburbs.
D、there are several ways to avoid city pollution.

答案D

解析 Refer first line paragraph 3.
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