【題目】The human race has already paid a heavy price for its slow to environment threats.

A. response

B. responsibility

C. resolution

D. resistance

【答案】A

【解析】句意：人類已經(jīng)為他們對環(huán)境威脅作出的遲緩反應(yīng)付出了重大代價。Respond 意為“反應(yīng)”后接介詞to。

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