Feeling tired lately？ Has the doctor said he cannot find anything wrong with you？ Perhaps

he sent you to a hospital, but all the advanced equipment there shows that there is nothing wrong.

Then consider this, you might be in a state of subhealth(亚健康).

Subhealth, also called the third state or grey state, is explained as a border line(临界)state between health and disease. According to an investigation by the National Health Organization, over 45 percent of subhealthy people are middle aged or elderly. The percentage is even higher among people who work in management positions as well as students around exam time.

Symptoms(症状)include a lack of energy, depression, slow reactions, insomnia(失眠), agitation(焦虑)and poor memory. Other symptoms include shortness of breath, sweating and aching in the waist and legs.

The key to preventing and recovering from subhealth, according to some medical experts, is to form. good living habits, alternate work with 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(营养的)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 subhealth.

According to this passage, which of the following is right？

A．When you are in a state of subhealth, you shoud go to see a doctor and buy some medicine.

B．When you are in a state of subhealth, you should stay home and keep silent.

C．When you are in a state of subhealth, you should find out the reasons and relax yourself

D．When you are in a state of subhealth, you shoud have yourself examined in foreign countries.