单项选择题

Physical fatigue is usually caused by __________.

A．too many stimulants
B．excess wastes in the bloodstream
C．diseases
D．lack of exercise
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单项选择题
The topic for this passage is __________.
A．the problems of insomnia
B．types of fatigue
C．the dangers of fatigue
D．people's need for rest
单项选择题
Which of the following could best summarize the main ideas of the passage
A．There is an increasing demand for servants, with a growing number of women joining the work force.
B．The emergence of a newly rich class and its self-perception in the Clinton years.
C．The self-perception of the newly rich changed in significant ways.
D．In the Clinton years, the rich got unbelievably rich.
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