[单项选择]
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 to affect mood. Secondary schools were selected to provide a mix of French and English partici
A. illogical
B. unscientific
C. meaningless
D. important
