Questions 1-6Choose the appropriate letters A-D and write them in boxes 1-6 on

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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.
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选项

答案 A

解析 Para 4: research suggests that it is the process of keeping clean that may be making indoor pollution worse.

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Questions1-4Thetexthas5paragraphs(A-E).Whichparagraphcontainseachof