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.
【C5】

选项 A、in
B、at
C、on
D、to

答案C

解析 这里是短语的固定结构,只能用介词on。on behalf of的意思是“代表”。
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