填空题
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 cancel. 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. {{U}} {{U}} 1 {{/U}} {{/U}}
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. {{U}}
{{U}} 2 {{/U}} {{/U}}The U. S. 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.
{{U}} {{U}} 3 {{/U}} {{/U}}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 U. S. 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. {{U}} {{U}} 4
{{/U}} {{/U}}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. {{U}} {{U}} 5 {{/U}}
{{/U}}
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. Which 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.