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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.
【C6】
选项 A、resides
B、traps
C、lingers
D、sticks
答案C
解析 破折号后的句子说明：一个在室外吸烟的妈妈进门抱孩子时仍会将孩子暴露于三手烟中，由此可判断香烟中的有害物质会留在吸烟者的身上——头发、皮肤、衣服和指甲中。C项lingers “萦绕，徘徊，逗留”能满足语义要求。A项resides“居住”的主语一般是人，指永久性的居住，用法不符合要求。B项traps“陷入”往往指被迫处于一个能受他人摆布的境地，语义不符合上下文要求。D项sticks“粘，贴”代入后表示三手烟粘在头发等上。这与现实不符。
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