※ 引述《chenemily (天天保持好心情)》之铭言： : Researchers took a group of teenagers who had never smoked and for one year : tracked whether they took up smoking and how their mental health changed. : Those who began smoking within a month of the study’s start were four times : as likely to be depressed at the study’s end than those who did not begin : smoking. Since nicotine in cigarettes changes brain chemistry, perhaps : thereby affecting mood, it is likely that smoking contributes to depression : in teenagers. 原文最後结论是：「抽烟导致青少年忧郁」 : Which of the following, if true, most strengthens the argument? : A.Participants who were depressed at the study’s start were no more likely : to be smokers at the study’s end than those who were not depressed. 支持题，一般答案分为「因果支持」、「对照组支持」、「反驳的反驳支持」三种。 先将答案A中 no more 略去不看，整句意思是「这些人因忧郁而开始吸烟」， 所以成为「倒因为果」的反驳答案。 然後，再将 no more 加回去，这时整句话的作用，便成为「反驳的反驳」， 而支持原主张。 以上，供参考 : B.Participants who began smoking within a month of the study’s start were : no more likely than those who began midway through to have quit smoking by : the study’s end. : C.Few, if any, of the participants in the study were friends or relatives of : other participants. : D.Some participants entered and emerged from a period of depression within : the year of the study. : E.The researchers did not track use of alcohol by the teenagers. : 可以请问一下a是哪里支持吗 : 其他选项错的我都可以排除 : 但a我不知道对在哪里 : 谢 --

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