单项选择题

The passage mainly deals with ______.

A．the symptoms of depression
B．introduction to depression
C．the causes of depression
D．treatment for depression
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单项选择题
According to the author, depression ______.
A．affects the poor and poor 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
The major topic discussed in the passage is ______.
A．the subtraction of water
B．the conversion of liquid water to water vapor
C．the salinity of ocean water
D．the effect of precipitation on the salinity of ocean water
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