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  3. Doctors believe that second-hand smoke may cause lung cancer in people who do not smoke. Nonsmokers often breathe in the smok

Doctors believe that second-hand smoke may cause lung cancer in people who do not smoke. Nonsmokers often breathe in the smok

admin2020-01-11  11
问题    Doctors believe that second-hand smoke may cause lung cancer in people who do not smoke.
   Nonsmokers often breathe in the smoke from other people’ s cigarettes. This is second-hand smoke. The US Environmental Protection Agency (美国环保局) reports that about fifty-three thousand people die in the United States each year as a result of exposure to second-hand smoke.
   It is harder for children to avoid second-hand smoke. In the United States, nine million children under the age of five live in homes with at least one smoker. Research shows that these children are sick more often than children who live in homes where no one smokes. The damaging effects of second-hand smoke on children also continue as they grow up. The children of smokers are more than twice as likely to develop lung cancer when they are adults as children of nonsmokers. The risk is even higher for children who live in homes where both parents smoke.
   People are becoming very aware of the danger of second-hand smoke. As a result, they have passed laws that prohibit people from smoking in many public places. Currently, 45 states in the US have laws that restrict smoking. The most well-known law doesn’ t allow people to smoke on short native airline flights, i. e. flights within the country.
The word "restrict" in the last paragraph is closest in meaning to______.
选项 A、limit
B、permit
C、control
D、persuade
答案A
解析 根据最后一段第二、三句可知，美国出台了禁止人们在公共场合吸烟的法律，这是对吸烟范围的一种限制，而不是控制人们吸烟，所以此处表达的是“目前美国有45个州制定了限制吸烟的法律”。restrict意为“限制”，limit(限制)与其意思最为接近。故选A。
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