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What is the passage mainly about?
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.

A.The
B.
B.The
C.S..
C.The
D.
D.The
E.


【参考答案】

C
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。所以C项“烟草巨头的现状及挑战”为正确。A项“禁烟广告的效力”、B项“美国严苛的烟草监管环境”和D项“电......

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