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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  40
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.
Which of the following statements is TRUE?
选项 A、The number of smokers’ children is twice greater than that of nonsmokers’ children.
B、People are now not allowed to smoke on short airline flights in the US.
C、Adults whose parents smoked when they were children develop cancer less frequently.
D、Second-hand smoke is not as dangerous as first-hand smoke.
答案B
解析 根据第三段倒数第二句“The children of smokers are more than twice as likely to develop lung cancer…”可知，吸烟者的孩子长大后患肺癌的概率是非吸烟者的孩子的两倍多，但并没有说吸烟者的孩子数量是非吸烟者的孩子数量的两倍多，所以A、C两项错误。根据最后一段最后一句“The most well-known law doesn’t allow people to smoke on short native airline flights…”可知，美国法律规定，在国内短途航班上不允许人们吸烟，所以B项正确。通读全文可知，文中并没有比较一手烟和二手烟哪个危害更大，所以D项错误。故选B。
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