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  3. More evidence is in that so-called e-cigarettes do let smokers stop smoking. Such cigarettes【C1】______to the user an oral nicoti

More evidence is in that so-called e-cigarettes do let smokers stop smoking. Such cigarettes【C1】______to the user an oral nicoti

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问题     More evidence is in that so-called e-cigarettes do let smokers stop smoking. Such cigarettes【C1】______to the user an oral nicotine without the carcinogens and other noxious chemicals found in tobacco smoke, by【C2】______a solution containing the drug. A study just【C3】______by Jamie Brown of University College, London, and his colleagues suggests they are 60% more successful at getting people to【C4】______tobacco by themselves than either willpower【C5】______or previously available quitting aids【C6】______nicotine patches.
    Dr. Brown and his team looked at data collected by the Smoking Toolkit Study, a programme run by them, and【C7】______by Cancer Research UK, a charity, and Britain’s health ministry. This programme【C8】______smokers’ behaviour in England, month by month, and has been asking about e-cigarettes since July 2009. The questions posed to【C9】______include whether they have tried to give up smoking, have succeeded, and what【C10】______they have taken.
    【C11】______those who had done it alone, rather than opting for a doctor’s assistance to help them quit, the researchers found that people who had【C12】______e-cigarettes for the purpose in the previous 12 months were more than twice as【C13】______as those who had used other devices, such as nicotine patches. A big win, apparently, for e-cigarettes—【C14】______, interestingly, they were only 40% more successful than【C15】______willpower by itself.
    As that second number【C16】______, in a study like this the raw figures can mislead. So Dr. Brown studied other variables such as just how【C17】______to nicotine a respondent was. That done, e-cigarettes had an almost【C18】______advantage over the other two approaches—suggesting not only that e-cigarettes were the clear winner, but also casting【C19】______on the value of things like nicotine patches or willpower. Dr. Brown’s " real world" survey thus【C20】______formal clinical trials of e-cigarettes , which also show their virtues as quitting aids.
【C11】
选项 A、In
B、Between
C、Among
D、Within
答案C
解析 该句的those who had done it alone从上下文来看，指的是“那些独自一人戒烟的人(即依靠个人意志力戒烟的人)”。而四个选项中，[A]In和[D]Within一般搭配时间或地点；[B]Between和[C]Among可以搭配人；between表示“二者之间”，among则表示“三者以上”。显然，文章指的是独立戒烟的群体，自然是三者以上，故选择among，即[C]Among为本题答案。
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