【題目】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“對……有害”;is important to“對……是重要的”;is necessary for“對……來說是必要的”。理解句意:如果我們把廢水排入江河里,對我們的環(huán)境有害?芍xA。

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