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5组文字，将其分别放回文章原有位置，以恢复文章原貌。 The Dangers of Secondhand 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. (46)
No one knows for sure why Mr. Gilson has lung
cancer. Nevertheless, doctors believe that secondhand smoke may cause lung
cancer in people who do not smoke because nonsmokers often breathe in the smoke
from other people’s cigarettes. (47) The US Environmental
Protection Agency reports that about 53,000 people die in the United States each
year as a result of exposure to secondhand 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. (48) They discovered that even nonsmokers had
unhealthy amounts of these toxic (有毒的) 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 cannot avoid secondhand 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 secondhand smoke. (49)
Research shows that children who are exposed to secondhand 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 secondhand smoke. (50)
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 secondhand smoke. D．However, secondhand
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.