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  3. Basically, there are three types of fatigue, physical, pathological (由疾病引起的), and psychological. As you might suspect, each diff

Basically, there are three types of fatigue, physical, pathological (由疾病引起的), and psychological. As you might suspect, each diff

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问题      Basically, there are three types of fatigue, physical, pathological (由疾病引起的), and psychological. As you might suspect, each differs significantly from the others.
     When you exercise your body you produce waste products. Muscles, for example, discard lactic acid (乳酸) into the blood; cells dump in carbon dioxide. When these wastes reach a certain level in the blood, the brain is notified and your activity level drops. Excess wastes in the muscles may produce soreness. If the blood of a physically fatigued animal is injected into a rested animal, it will produce fatigue. The solution to this type of fatigue is simple-rest. That should revive you; if it doesn’t, another cause should be sought.
     Have you ever become involved in so many activities that you had to be in two places at once? This is what happens when your body has a disease. The cells are overtaxed and cannot keep up with both fighting the disease and keeping you active. The result is fatigue. Some communicable diseases like the flu and colds are notorious for draining your energy. Other non-communicable diseases, like anemia (贫血), drain you because you are lacking an important body ingredient. Being overweight can cause pathological fatigue. It should be obvious that this type of fatigue is not going to go away without treatment. In a way, pathological fatigue is a lifesaver. It lets you know something is wrong and that you need rest. Even a poor diet can produce pathological fatigue. Frequently, people who go on crash diets develop pathological fatigue, and if the diet is not improved, they may do physical harm to their bodies.
     Here is the most common type of fatigue. Almost everybody experiences it now and then. Often, the cause is an emotional war you arc waging with yourself or those around you. Some of these familiar factors can bring on psychological fatigue: worries, stress, lack of exercise, boredom, depression. If you know someone with psychological fatigue, would you advise him to rest? No way! That might be fine for our other types of fatigue, but for this one, it’s deadly. If you are ever going to be able to cope with stress, depression, or worry, you need oxygen in your cells and a more optimistic attitude. Get out of the chair and do something! Believe it or not, many people throw themselves into physical labor like cleaning or carpentry to "defatigue" themselves. If you find yourself in a particularly stressful situation that you can’t physically escape, escape mentally. When fatigue continues, maybe you need to get to the root of the problem.  
Which of the following statements is true according to the passage?
选项 A、Sleep is the solution for all types of fatigue.
B、Psychologically healthy people do not suffer from fatigue.
C、Changing your diet cannot cure psychological fatigue.
D、You won’t become fatigued if you are doing something you enjoy.
答案C
解析 综合题 。第三段段末两句指出，改善不良的饮食习惯有助于消除病理性疲劳，但是在第四段对心理性疲劳的叙述中仅提到进行体力劳动有助于消除疲劳，但是没有提到改善不良的饮食习惯，由此可见改善不良的饮食习惯不能消除心理性疲劳，所以C项的说法正确。
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