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.
【C7】

选项 A、what
B、which
C、that
D、as

答案C

解析 从句意和句子结构分析,空格后面是一个同位语从句,对evidence一词进行说明。因此,本题要求填入引导同位语从句的连接词that,选项C为正确答案。A项what可引导作主语、宾语或表语的从句,但不引导同位语从句,B项which作关系代词时引导定语从句,D项as或引导状语从句,或引导定语从句,因此用在本句显然不正确。
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