It _________our environment if we pour waste water into the rivers.

A. is harmful to B. is important to C. is necessary for

A 【解析】句意：如果我們把廢水排入河流，對我們的環(huán)境是有害的。A. is harmful to對...有害；B. is important to 對...重要；C. is necessary for對...是必要的�！皬U水排入河里”對環(huán)境是有害的。故選：A。
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