Question

【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

Answer 1

【答案】A

【解析】句意：如果我们把废水排入河流，对我们的环境是有害的。A. is harmful to对...有害；B. is important to 对...重要；C. is necessary for对...是必要的。“废水排入河里”对环境是有害的。故选：A。