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72.(30176-!-item-!-188;#058&005083)
A study followed a group of teenagers who had never smoked and tracked whether they took up smoking and how their mental health changed.After one year, the incidence of depression among those who had taken up smoking was four times as high as it was among those who had not.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?
A. Participants who were depressed at the start of the study were no more likely to be smokers after one year than those who were not depressed.
B. The study did not distinguish between participants who smoked only occasionally and those who were heavy smokers.
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.
答案选的是A。看了好多遍都没明白A选项想表达什么= = ... 请NN赐教~~
做的时候我选的是C。当时想的是，要排除掉每个被试者之间的影响，比如说如果有两个被试者是朋友或者亲戚的话，互相之间会有经常性的接触，没有吸烟的被试者有可能会因为朋友或者亲戚吸烟而受到影响...
请NN帮我看看我的分析哪里出错了呀
谢谢！ |
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发表于 2011-5-12 10:37:49
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