綜合類-補全短文（3月13日）_職稱英語網(wǎng)校

補全短文

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．________. 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.

A、The risk is even higher for children who live in homes where both parents smoke.

B、In the United States，nine million children under the age of five live in homes with at least one smoker.

C、This smoke is called secondhand smoke.

D、No one knows for sure why Mr. Gilson has lung cancer.

【正確答案】 C

【答案解析】 前一句提到，不吸煙者時常吸入他人香煙中冒出的煙，接下來應(yīng)首選對此煙加以定義的句子。

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