【題目】— As we know, health is above wealth. More and more people care about the quality of air.

— I couldn’t agree with you more. The air requires ________ to keep us healthy.

A.be improvedB.improvingC.to improve

【答案】B

【解析】

句意：——我們知道，健康高于財富。越來越多的人關心空氣質(zhì)量。 ——我完全同意你的看法�？諝庑枰纳埔员３治覀兊慕】�。

考查主動表被動。A. be improved被動語態(tài)；B. improving動名詞；C. to improve動詞不定式。根據(jù)英語語法，require（要求、需要）后面可接doing主動表被動。B選項符合句子結(jié)構(gòu)，故選B。

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