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. Which of the following, if true, most strengthen 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. 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 participan 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. 答案是A 可是有点转不过来 期他都很明显的错 了CD大家的讨论 这题是排除因果倒置 结论； 抽菸----->忧郁 (A)忧郁 不导致抽菸 请问这样哪里有支持 要不是因为其他错的更离谱 我也不会选A 可以请教一下 是怎样推出来的吗 谢谢 -- (1)问题____ (A)孬(B)奀(C)尖(D)奔 (2) 不离不弃 被当____ (A)盲(B) 臬(C)皂(D)柏 (3) 时机若对 我第一个 ___ (A)加入工会(B)加入大联盟(C)退休(D)打入WWE (4)╰(‵◇ ′#)╯代表哪个单字(A)good job (b)Come on (c)fuck u (d) shit (5) 监督赏可拿到多少赏金(A)3万镁(B)一万镁(C)2千NT(D)一万NT --

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