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    Feel tired lately?Has a doctor said he can’t find anything wrong with you?Perhaps he sends you to a hospital,but all the advanced equipment there shows there is nothing wrong with you.
Then,consider this:you might be in a state of sub-health(亚健康).
Sub-health,also called the third state or gray state,is explained as borderline state between health and disease.
According to the investigation by the National Organization,over 45 percent of sub-health people are middle-aged or elderly.The percentage is even higher among people who work in management positions as well as students around exam-week.
Symptoms(征兆)include a lack of energy,depression,slow reactions,insomnia(失眠),agitation, and poor memory.Other symptoms include shortness of breath,sweating and aching in the waist and legs.
The key to preventing and recovering from sub-health,according to some medical experts,is to form good living habits, alternate work and rest, exercise regularly,and take part in open air activities.
As for meals,people are advised to eat less salt and sugar.They should also eat more fresh vegetables,fruits,fish because they are rich in nutritional elements—vitamins and trace elements(微量元素)—that are important to the body.
Nutrition experts point out that it is not good to eat too much at one meal because it may cause unhealthy changes in the digestive tract(消化道).They also say that a balanced diet is very helpful in avoiding sub-health.
【小题1】When you are in a state of sub-health,you should ________.

A.stay home and keep silent
B.go to a doctor and buy some medicine
C.not consider it very serious
D.find out the reasons and relax yourself
【小题2】Middle-aged people may be easy to get sub-health because ________.
A.they have used up their energy
B.they have lost their living hopes
C.they have more pressure in life and work
D.they have changed their way of life
【小题3】The key to preventing you from falling into a state of sub-health is to ________.
A.keep on working regularlyB.go to sleep a bit earlier
C.form good living habitsD.take medicine if necessary
【小题4】The underlined word “alternate” in this passage is closest in meaning to ________.
A.arrange by turnsB.cause to take place
C.make up forD.keep away from


【小题1】D
【小题2】C
【小题3】C
【小题4】A

解析提示:从全文可以看出,亚健康是身体对压力、疲劳的一种反应,即使最先进的仪器也查不出病因。所以不必去医院,也不必吃药,但是不能听之任之,不认真对待。正确的方法是找出原因、减轻压力、消除疲劳、平衡膳食。
【小题1】答案:D
提示:亚健康的起因与疲劳有关系,但不是已将体力用完,排除A项。B、D两项文章没涉及。根据常识和第四段最后一句,我们也能判断正确答案为C项。
【小题2】答案:C
【小题3】答案:C 文章倒数第三段第一句“…is to form good living habits”
【小题4】答案:A 从文中可看出:形成好的生活习惯,要劳逸结合,即轮流工作与休息

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