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  3. It took decades to prove that cigarette smoking causes cancer, heart disease, and early death. It took【C1】________years to estab

It took decades to prove that cigarette smoking causes cancer, heart disease, and early death. It took【C1】________years to estab

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问题     It took decades to prove that cigarette smoking causes cancer, heart disease, and early death. It took【C1】________years to establish that secondhand smoke also kills. Now scientists are worried about another cigarette-related phenomenon: thirdhand smoke. It’s real, and it’s found everywhere. Without knowing it, indoor smokers have left a toxic【C2】________that continues years after their last cigarette was extinguished.
    Researchers now know that thirdhand smoke combines with some substances to create new compounds. Thirdhand smoke【C3】________and settles with dust,【C4】________down to carpeting and furniture【C5】________, and makes its way deep into the material in paneling and wall. It【C6】________in the hair, skin, clothing, and fingernails of smokers—【C7】________a mother who doesn’t smoke【C8】________her kids, smokes outside, then comes inside and holds the baby is exposing that child to thirdhand smoke. The new compounds are【C9】________to clean up, have a long life of their own, and many may cause cancer. And the contamination becomes more toxic【C10】________time.
    No one knows, in this relatively new field of research, how long the compounds created by smoke and environmental pollutants last. "In homes where we know no smoker has lived for 20 years, we’ve still found【C11】________of these compounds in dust, in wallboard," says a scientist. But scientists do know that babies and children are most【C12】________to the toxic effects of thirdhand smoke. They【C13】________on rugs, fall asleep on carpets, and teethe on furniture, all of which could be【C14】________with thirdhand smoke.
    Researchers aren’t just worried about the risk of cancer. Thirdhand smoke could be【C15】________other health problems. Those who move into houses or apartments【C16】________owned by smokers might be exposed as well. And thirdhand smoke is difficult to【C17】________. It’s virtually impossible to remove this stuff【C18】________you remove the flooring and wall.
    Experts say much more work needs to be done on the【C19】________of the problem, the health risks, and effective ways to clean up the compounds. They advise parents not to expose their children to thirdhand smoke, not to【C20】________hotel rooms or cars used by smokers.
【C20】
选项 A、rent
B、decorate
C、consume
D、retrieve
答案A
解析 上文多处提到三手烟会残留在室内并且难以清除，考虑到三手烟对孩子的危害，应判断专家建议父母不要住进吸烟者用过的酒店或使用他们用过的汽车。A项rent“租用”符合句意。装不“装饰”(B项decorate)酒店房间对保护孩子的健康关系不大。C项consume“消耗，花费”代入后指“消耗酒店或用尽汽车”，句意不通顺。D项retrieve“取回，复取”代入后指“不要收回酒店房间或汽车”，不合逻辑。
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