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简答题 __________.

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解析: total exposure。本题的出题点在depend on处。题干问一个人受空气污染影响的程度取决于有害化学物质的_____ 。讲座中提到The extent to which all individual is harmed by air poHution usually depends on thetotal exposure to the damaging chemicals,故得答案total exposureo

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