【題目】Polluted air does harm to the living things on the earth. It ______ kill plants as well as even humans.

A.canB.shouldC.mustD.need

【答案】A

【解析】

句意：被污染的空氣對地球上的生物有害。它可以殺死植物甚至人類。

考查情態(tài)動詞。can可能，能夠；should應(yīng)該；must必須；need需要；根據(jù)“kill plants”可知是一種能力推測，可推測出此處是“能夠”，故選A。

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