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【题目】It _________ our environment if we pour waste water into the rivers.
A.is harmful to
B.is important to
C.is necessary for

【答案】A
【解析】be harmful to“对……有害”;is important to“对……是重要的”;is necessary for“对……来说是必要的”。理解句意:如果我们把废水排入江河里,对我们的环境有害。可知选A。

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