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单选题 Why can the content of harmful components in secondhand smoke be several times or even dozens of times higher than that in direct smoke

A. Because some people smoke in enclosed spaces

B. Because the chemicals in tobacco can cause cancer

C. Because insufficient combustion makes secondhand smoke more toxic than the direct smoke

D. Because there are more non-smokers than smokers

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时间:2023-05-08 04:06:57

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