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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 as 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 strengthens the argument?

【选项】Some participants entered and emerged from a period of depression within the year of the study.

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题目基本信息

  • 所属科目:逻辑CR
  • 题目来源1:GWD-83
正确率:70%