57．What is the main topic of this passage?
　　[A]The consequences of fatigue．
　　[B]The reason why people need rest．
　　[C]The dangers of fatigue．
　　[D]Types of fatigue．
　　58．Physical fatigue is usually caused by ＿＿．
　　[A]transmittable diseases
　　[B]too many stimulants
　　[C]lack of physical exercise
　　[D]excess wastes in the bloodstream
　　59．We learn from the passage that pathological fatigue happens when ＿＿．
　　[A]you have to be in two places at once
　　[B]the cells are subject to an excessive burden
　　[C]the body is free from diseases
　　[D]you are involved in too many activities
　　60．How does the author see pathological fatigue?
　　[A]Some pathological fatigue is good for people．
　　[B]Everyone is vulnerable to pathological fatigue．
　　[C]Pathological fatigue needs no medical attention．
　　[D]Pathological fatigue harms people psychologically only．
　　61．Which of the following statements is true about psychological fatigue?
　　[A]Psychological fatigue happens to those involved in war．
　　[B]Rest is the only solution for psychological fatigue．
　　[C]Physically healthy people do not suffer from psychological fatigue．
　　[D]Physical labor can get some people out of psychological fatigue．

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