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.
实验开始的一个月内吸烟的青少年得抑郁症的概率是不吸烟的青少年得抑郁症概率的4倍，又因为尼古丁可以改变大脑化学物质。所以吸烟导致了青少年的抑郁症。问support
choice a, 在实验开始就已经得抑郁症的青少年，并不会比那些不得抑郁症的青少年，在实验结束之前开始吸烟。correct，排除了因果倒置
登录 或 注册 后可以参加讨论