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

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热门试题

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

单项选择题

It can be known from the passage that increase in the salinity of ocean water is caused by______.

A．melting of sea ice
B．precipitation
C．evaporation
D．supplement of salt