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  3. The Dangers of Second-hand Smoke Most people know that cigarette smoking is harmful to their health. Scientific research sho

The Dangers of Second-hand Smoke Most people know that cigarette smoking is harmful to their health. Scientific research sho

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问题                     The Dangers of Second-hand Smoke
    Most people know that cigarette smoking is harmful to their health. Scientific research shows that it causes many kinds of diseases. In fact, many people who smoke get lung cancer. However, Edward Gilson has lung cancer, and he has never smoked cigarettes. He lives with his wife Evelyn, who has smoked about a pack of cigarettes a day throughout their marriage.【B1】______
    No one knows for sure why Mr. Gilson has lung cancer. Nevertheless, doctors believe that second-hand smoke may cause lung cancer in people who do not smoke because nonsmokers often breathe in the smoke from other people’ s cigarettes.【B2】______The US Environmental Protection Agency reports that about 53 , 000 people die in the United States each year as a result of exposure to second-hand smoke.
    The smoke that comes from a lit cigarette contains many different poisonous chemicals. In the past, scientists did not think that these chemicals could harm a nonsmoker’ s health.【B3】______They discovered that even nonsmokers had unhealthy amounts of these toxic chemicals in their bodies. As a matter of fact, almost all of us breathe tobacco smoke at times, whether we realize it or not. For example, we can not avoid second-hand smoke in restaurants, hotels and other public places. Even though many public places have nonsmoking areas, smoke flows in from the areas where smoking is permitted.
    It is even harder for children to avoid second-hand smoke.【B4】______Research shows that children who are exposed to second-hand smoke are sick more often than children who live in homes where no one smokes and that the children of smokers are more than twice as likely to develop lung cancer when they are adults as are 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 dangers of second-hand smoke.【B5】______
A. Recently, though, scientists changed their opinion after they studied a large group of nonsmokers.
B. The Gilsons have been married for 35 years.
C. This smoke is called second-hand smoke.
D. However, second-hand smoke is dangerous to all people, old or young.
E. As a result, they have passed laws which prohibit people from smoking in many public places.
F. In the United States, nine million children under the age of five live in homes with at least one smoker.
【B5】
选项
答案E
解析 前面一句讲的是人们逐渐意识到二手烟的危害，因此接下来的句子应表示人们采取措施来减少二手烟的危害。故选E。
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