单项选择题

The passage is mainly a______.

A．description of the symptoms of depression
B．brief introduction of depression
C．summary of tile causes of depression
D．list of treatment of depression

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单项选择题

According to the author, depression ______.

A．affects the poor and less educated people more than the rich and successful ones
B．seldom attacks executives
C．is not limited to any particular class of people
D．is caused by one's ambition

单项选择题

Studies show depression______.

A．is more common today than in the past decades
B．was more common in the old generations
C．increased ten times in the days of our parents and grandparents
D．afflicts only young people