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  3. Smoking Can Increase Depressive Symptoms in Teens While some teenagers may puff on cigarettes to "self - medicate" against t

Smoking Can Increase Depressive Symptoms in Teens While some teenagers may puff on cigarettes to "self - medicate" against t

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问题                 Smoking Can Increase Depressive Symptoms in Teens
    While some teenagers may puff on cigarettes to "self - medicate" against the blues, scientists at the University of Toronto and the University of Montreal have found that smoking may actually______【51】depressive symptoms in some teens.
    "This observational study is one of the few to examine the perceived______【52】benefits of smoking among teens," says lead researcher Michael Chaiton, a research associate at the Ontario Tobacco Research Unit of the University of Toronto.
    "______【53】cigarettes may appear to have self - medicating 【54】______or to improve mood, in the long term we found that teens who started to smoke reported higher depressive symptoms. "
    As part of the study, some 662 high school teenagers completed up to 20 questionnaires 【55】______their use of cigarettes of affect mood. Secondary schools were selected to provide a mix of French and English participants, urban and rural schools, and schools 【56】______in high, moderate and low socioeconomic neighborhoods.
    Participants were divided into three 【57】______: never smokers; smokers who did not use cigarettes to self - medicate, improve mood or physical 【58】______;smokers who used cigarettes to self - medicate. Depressive symptoms were measured u-sing a scale that asked how often participants felt too tired to do things; had 【59】 ______going to sleep or staying 【60】______; felt unhappy, sad, or depressed; felt hopeless about the future; felt vexed, antsy or tense; and worried too much a-bout things.
    "Smokers who used cigarettes as mood 【61】______had higher risks of elevated depressive symptoms than teens who had never smoked," says co -researcher Jennifer O’Loughlin, a professor at the University of Montreal Department of Social and Preventive Medicine. "Our study found that teen smokers who reported emotional benefits from smoking are at higher risk of 【62】______depressive symptoms. "
    The 【63】______between depression and smoking exists 【64】 ______among teens that use cigarettes to feel better. "It’s 【65】______to emphasize that depressive symptom scores were higher among teenagers who reported emotional benefits from smoking after they began to smoke," says Dr. Chaiton.
选项 A、occasionally
B、scarcely
C、probably
D、principally
答案D
解析 本题有一定难度，考查副词的用法，可以先看选项得到信息提示。从上下文的逻辑来看，文章此处是说“吸烟和抑郁症的联系主要存在于吸烟的年轻人”，principally，指“主要一地”，答案是D。
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