- 問題詳情: Withthe61______(develop)ofindustry,airpollutionisgettingmoreandmoreserious.InBeijing,manypeoplesufferdifferentkindsofillnessesbecause62________airpollution.Airpollutioniscausedbythefollowing63_______:abouthalfoftheproblemiscausedbyvehicles.Th...
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