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- 問題詳情：Withthe 61 (develop)ofindustry,airpollutionisgettingmoreandmoreserious.InBeijing,manypeoplesufferdifferentkindsofillnessesbecause 62 airpollution. Airpollutioniscausedbythe 63 (follow)reasons:abouthalfoftheproblem...
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