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  3. Any American who has bought a pack of cigarettes since the mid-60s might have seen the health warnings. It says, "SURGEON GENERA

Any American who has bought a pack of cigarettes since the mid-60s might have seen the health warnings. It says, "SURGEON GENERA

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问题     Any American who has bought a pack of cigarettes since the mid-60s might have seen the health warnings. It says, "SURGEON GENERAL’S WARNING: Smoking Causes Lung Cancer, Heart Disease, And May Complicate Pregnancy." Such government warnings work,【C1】________— research has shown that smokers in countries with strong warnings know more about smoking【C2】________than those in countries where warnings are weaker. But it’s unclear whether smokers who see any warning【C3】________smoke less.
    Public-health advocates have known for years that individualized messages are far more【C4】________at getting smokers to stop. For instance,【C5】________a doctor reminds a patient that her sister has promised to help her【C6】________, that patient will be much more likely to stop smoking than someone who just sees a(n)【C7】________message on a cigarette pack. A recent study shows that tailored antismoking messages engage brain regions involved in how people see themselves. Those regions are associated with emotion【C8】________basic human awareness and, possibly, awareness of others’【C9】________of us.
    The authors of the study, a University of Michigan team led by psychologist Hannah Faye Chua,【C10】________91 smokers who wanted to quit. The participants, who smoked an average of 17 cigarettes per day,【C11】________medical imaging scans for one hour while different messages appeared on a screen. Some messages were tailored to their【C12】________histories (for example, " A concern you have is being tempted to smoke when【C13】________other smokers"). Some messages were general anti-smoking【C14】________.
    The researchers found that the tailored messages【C15】________the two brain regions significantly more than the non-tailored and【C16】________messages. In other words, reading a short sentence changed their brain activity—【C17】________those who showed stronger activity in those regions were more likely to quit smoking.
    The reason this paper is important is that it【C18】________a growing body of research showing that what is often mocked as  "talk therapy" can produce real changes in brain【C19】________. If you really want to quit smoking, you should commit to a(n)【C20】________behavioral-therapy program. It will not only help you stop; it could change how your brain works.
【C5】
选项 A、if
B、although
C、before
D、until
答案A
解析 句子的主句提到“这个病人戒烟的可能性要大得多”，从句是“医生提醒病人她姐姐承诺过要帮助她”。根据主句的一般将来时态，可知从句是现实条件句，表示假设，故A项if“如果”为正确答案。B项although“虽然”，表示让步。C项before“在……之前”及D项until“直到”，引导时间状语从句。这三个词都不能引导条件句。  
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