单选题:Muchofthepollutioncouldbecontrolledifonly(  ).

题目内容:

Muchofthepollutioncouldbecontrolledifonly(  ). A.peoplewouldpaymoreattentiontotheproblem
B.governmentswouldtakeeffectivemeasures
C.allsidesconcernedwouldmakemoreefforts
D.farmerswoulduselessartificialfertilizers

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答案解析:

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