GWD17-Q16~求解释~

evelyn205205

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?

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 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.

答案是A。那些一开始就有抑郁表现的人不会比那些没有抑郁表现的人更容易变成一个吸烟者。
和原题有什么关系么？原文不是要突出是吸烟导致人变得抑郁么？
请NN来指教~

bitieming

有关系呀~如果那些研究中开始抽烟并表现抑郁的人在研究开始之前就呈现出一种比其他人更容易抑郁的特质，那么很难说研究最后那些人的抑郁到底是由吸烟导致的还是由他们自身的特质导致的

evelyn205205

有关系呀~如果那些研究中开始抽烟并表现抑郁的人在研究开始之前就呈现出一种比其他人更容易抑郁的特质，那么很难说研究最后那些人的抑郁到底是由吸烟导致的还是由他们自身的特质导致的

-- by 会员 bitieming (2011/8/1 13:05:56)

这位NN，你好像是在翻译B吧。A中没有说在研究中开始抽烟这件事啊~
求指教~

evelyn205205

求指教~

luowen6

~题目中说那些在研究过程中开始吸烟的人最后表现忧郁，   A否定了"那些本来就忧郁人更可能吸烟"，所以是吸烟导致忧郁，不是忧郁导致吸烟的~

evelyn205205

~题目中说那些在研究过程中开始吸烟的人最后表现忧郁，   A否定了"那些本来就忧郁人更可能吸烟"，所以是吸烟导致忧郁，不是忧郁导致吸烟的~

-- by 会员 luowen6 (2011/8/1 20:41:02)

right！
You just hit the point！