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Ourearthisintrouble.Ourdrinkingwaterisbecomingdirtier,a...
问题详情:Ourearthisintrouble.Ourdrinkingwaterisbecomingdirtier,andtheairisnotasclearasbefore. Rivers,lakesandseas__61____(pollute)bypeopleand__62__(factory).Youmightthinkthereisnothingyoucando__63____...