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 using a scale that asked how felt too fired to do things: had (59) going to sleep or staying asleep; felt unhappy，sad. or depressed; felt hopeless about the future；felt vexed, antsy or tense; and worried too much about things.

　　Smokers who used cigarettes as mood (60) had higher risks of elevated depressive symptoms (61)teens who had never smoked, says co-researcher Jennifer 0Loughlin，a professor at the University of Montreal Department of Social and Preventive Medicine．0ur study found that teen smokers who reported emotional benefits from smoking are (62) higher risk of depressive symptoms.

　　The (63) between depression and smoking exists (64) among teens that use cigarettes to feel better. Its (65) to emphasize that depressive symptom scores8 were higher among teenagers who reported emotional benefits from smoking after they began to smoke, says Dr. Chaiton．

　　51．A diagnose B increase C examine D treat

　　52．A financial B material C emotional D political

　　53．A Whatever B Although C Since D If

　　54．A road B term C journey D distance

　　55．A affect B judge C lead D study

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