Pollution caused by motor vehicles can kill more people a year than road accidents. The World Health Organization(WHO)has found

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问题     Pollution caused by motor vehicles can kill more people a year than road accidents. The World Health Organization(WHO)has found that after studying【C1】______ countries— Austria, France and Switzerland.
    Long-term【C2】______ to exhaust fumes caused the premature death of 21 000 people【C3】______ respiratory and heart disease in the three countries,【C4】______ with nearly 10 000 deaths from accidents, WHO【C5】______ said last week.
    The report was prepared for【C6】______ to a conference of 70 environment and health ministers being organized by the United Nations agency in London. "The growing evidence【C7】______ air pollution is causing a major health burden adds to the effects of road traffic through noise, accidents and barriers【C8】______ cycling and walking, and we need to approach this head on," said Carlos Dora, a doctor with the WHO’s European center for environment and health.
    "We are paying a huge【C9】______ for this excessive road transport; with our money and with our health. " One-third of pollution from fine particles which congest the lungs was【C10】______ by motor vehicles, rising to one-half in cities, the WHO found.
【C3】

选项 A、in
B、with
C、by
D、from

答案D

解析 从句意看,此处要求一个表示原因的介词,因此D项from为正确答案,其他三个选项的介词均不表示原因。
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