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导语：以下英语网为大家整理了全面的职称英语考试历年真题及答案解析，《职称英语考试试题汇总：历年真题及答案解析》供大家参考学习。更多职称英语考试试题敬请关注英语网！ 【推荐】关注英语网微信：yingyuwang2013，更快获取真题答案及成绩查询信息。 第6部分：完形填空（第51-65题，每题1分，共15分） 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 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 Toronto1 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 effects or to improve mood, in the long 54 we found that teens who started to smoke reported5 higher depressive symptoms. As part of the study，some 662 high school teenagers completed up to 20 questionnaires about their use of cigarettes to (55) 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 neighbourhoods6． | 
