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
Which of the following is NOT TRUE in the case of pathological fatigue
A．You are involved in so many activities that you have to be in two places at once.
B．Your body has a disease.
C．The cells fail to deal with fighting the disease and keeping you alive at the same time.
D．The first thing to do is to cure the disease.
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
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