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英语六级
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A.The potency of tobacco's advertising bans.
B.The hostile regulatory climate of tobacco in the U.S..
C.The current situation and challenge of big tobacco firms.
D.The introduction and growth of e-cigarettes.

参考答案C
解析:主旨题。根据题干关键词需纵观全文。文章前三段讲吸烟的危害在美国引起重视.并加大了广告限制及禁烟标志力度;第四段引出电子香烟;第五段指出电子香烟所占的市场份额:后面谈到烟草公司的反应及发展趋势。因此,正确答案是C。

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