C Cigars contain less harmful substances than cigarettes.

　　D Increase in cigar-smoking does not affect public health much.

　　4.What is the doctors advice to those cigar-smokers?

　　A To give it up completely.

　　B To give up part of it.

　　C Not to think about it any more.

　　D To cure the diseases first.

　　5. In the context of this passage, secondhand smoke means

　　A smoking bad-quality cigars.

　　B smoking very cheap cigars.

　　C being near cigar smokers when they are not smoking.

　　D being near cigar smokers when they are smoking.

　　答案与题解：

　　1.D 第三段中smoking three or four cigars a day increased the risk of oral cancer to 8.5 times, the risk for nonsmokers and the risk of esophageal cancer by four times the risk of nonsmokers. 谈论了吸烟者患癌症的可能性。

　　2.B 第一段中提到 lip，tongue, mouth, throat 四种，第二段中提到 lung, esophagus, larynx 三 种，共七种，第三段中的oral是对lip, tongue, mouth等的统称，不应再算做一种。

　　3.A倒数第三段中的一句话概括了文章的中心，即...cigars are not safe alternatives to cigarettes and may be addictive.

　　4.A 倒数第二段中医生的建议是To those currently smoking cigars, quitting is the only way to eliminate completely the cancer. ??，艮P 完全方文弃 0

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