It may be necessary, in order that future【C1】______can enjoy clean air, that more of the【C2】______is borne by long-term central

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问题     It may be necessary, in order that future【C1】______can enjoy clean air, that more of the【C2】______is borne by long-term central government fund As air pollution varies enormously from place to place and can, indeed, be very local, it may also be necessary for the central government to【C3】______money so that local authorities can【C4】______special local problems. That these can be significant was shown by the report made in 1970【C5】______behalf of the London Boroughs Association. This【C6】______that in central London since 1958 smoke concentrations have decreased by 80 percent, whereas sunshine has increased by 70 percent and winter visibility has【C7】______threefold. There have been【C8】______in mortality and hospital admissions【C9】______with air pollution and in the response to it of bronchitis, as well as clear if less documented increases in plant types and bird【C10】______in the cities.
【C7】

选项 A、improved
B、shared
C、added
D、proved

答案A

解析 A项improved意为“提高,改进”,B项shared意为“分享,分担”,C项added“增加”和D项proved“证实”虽都是动词,但与上下文的意思不吻合。根据题意,这里应选A。
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