希賽網為考生們整理了2016年首都經濟貿易大學考博英語閱讀理解部分真題，供考生們備考復習。

Doctors believe that secondhand smoke may cause lung cancer in people who do not smoke. Nonsmokers often breathe in the smoke from other people's cigarettes. This is secondhand smoke. The U.S. Environmental Protection Agency reports that about fifty-three thousand people die in America 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 harm a nonsmoker's health. Recently, though, scientists expressed their opinion after they studied a large group of nonsmokers. 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 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. In America, 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 the children who live in homes where no one smokes. The damaging effects of secondhand 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 the children of nonsmokers. The risk is even higher for the children who live in homes where both parents smoke.

1.It can be inferred that about fifty-three thousand people die in American ( ).

A、because of smoking

B、though they don't smoke

C、because their parents smoke

D、though their parents don't smoke

2.Non-smokers get harmed by smokers ( ).

A、because of the poisonous smoke they breathe in

B、if they live together

C、when there is no non-smoking area in the public utilities

D、though the poisonous chemicals contained in the smoke don't harm them

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