扫描二维码，直接登录
题库 / GMATLA-CR-59
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 strengthens the argument?
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.
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.
Few, if any, of the participants in the study were friends or relatives of other participants.
Some participants entered and emerged from a period of depression within the year of the study.
The researchers did not track use of alcohol by the teenagers.
关于b选项和a选项有一点突发奇想。b选项其实也是在增强“先抽烟的更难戒烟“，那么在一定条件下肯定是能够增强逻辑链条的，如果它是一个目标推理题或者导致结果问你assumption的题，那么b也是对的。这里不选是因为这是一道体现影响力(explanation)的题，他不能体现抽烟对抑郁症的影响力，要体现影响力，还是得靠排他因！
登录 或 注册 后可以参加讨论