According to the investigation by the National Health Organization，over 45 percent of sub-healthy people are middle-aged and elderly.The percentage is even higher among people who work in management positions as well as students around exam-week.

　　Symptoms of sub-health include a lack of energy，depression，slow reactions，insomnia，agitation (焦虑不安)，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，and fish because they are rich in nutritional elements—vitamins and trace elements－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.They also say that a balanced diet is very helpful in avoiding sub-health.

　　5．According to this passage，which of the following is TRUE?

　　A．When you are in a state of sub-health，you should stay at home and keep silent.

　　B．When you are in a state of sub-health，you should go to see a doctor and buy some medicine.

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