补全短文

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.

KET线上班

6-12岁英语高频重点词汇，搞定小学英语全段考试

399查看

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.

【正确答案】 C

【答案解析】 前一句提到，不吸烟者时常吸入他人香烟中冒出的烟，接下来应首选对此烟加以定义的句子。

阅读推荐：职称英语培训 学派网职称英语 新东方职称英语 环球网校职称英语 职称英语网校排名