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  3. Betting against an industry with addicts for customers carries obvious risks.【C1】________these are uncertain times for Big Tobac

Betting against an industry with addicts for customers carries obvious risks.【C1】________these are uncertain times for Big Tobac

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问题     Betting against an industry with addicts for customers carries obvious risks.【C1】________these are uncertain times for Big Tobacco. Electronic cigarettes, once dismissed as a novelty, now pose a serious【C2】________. E-cigarettes work by turning nicotine-filled liquid into vapour, which is then breathed in. A user is【C3】________said to be "vaping", not smoking. More important, he or she is not【C4】________all the toxic substances found in【C5】________smokes.
    In 2012 sales of e-cigarettes in America were between $300m and $500m, say analysts. That is【C6】________compared with the $80 billion-plus market for conventional cigarettes in the country. But e-cigarette sales doubled last year, and are expected to double again next year. Analysts believe sales of e-cigarettes could【C7】________sales of the normal sort within a decade.
    That may【C8】________how governments react. E-cigarettes are probably not good for you. One study showed that vaping【C9】________user’s lung capacity.【C10】________a switch from smoking【C11】________vaping could improve public health, some say. E-cigarettes may help smokers quit more【C12】________than nicotine patches or gum. This notion has not been thoroughly tested, however, so governments are【C13】________.
    America has warned e-cigarette manufacturers not to make health claims. New tobacco guidelines in Europe would either tightly limit the nicotine content of e-cigarettes or【C14】________them to undergo clinical trials.
    None of this has stopped companies from【C15】________to consumers. In America and Britain advertisements for e-cigarettes have appeared on television—forbidden【C16】________for standard cigarettes. Craig Weiss, the head of NJOY, America’s top-selling brand of e-cigarettes, swears to make traditional ones【C17】________. His ads crow: "Cigarettes, you’ve met your match."
    America’s tobacco giants do not think he is blowing smoke. Last year Lorillard (the maker of brands such as Newport and Kent) bought Blu, an e-cigarette maker. NJOY is rumored to be facing a【C18】________, perhaps by Altria (the maker of Marlboro). Foreign cigarette makers also have【C19】________in the industry, while other firms are working on their own vaporous offerings.
    E-cigarette executives dream of beating traditional cigarettes. But as they struggle with taxes, patents and red tape, they may come to【C20】________Big Tobacco’s deep pockets.
【C11】
选项 A、to
B、for
C、off
D、on
答案A
解析 根据首段提到的vaping与smoking间的逻辑关系，可知空格处介词与主语中心词switch(改变，转换)搭配后应表示“从吸烟转变成吸雾”，故A项to符合搭配要求。介词for、off和on通常不与充当名词的switch搭配。
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