阅读理解。
If you often feel tired and the doctor can't find anything wrong with you, you may be in a state of
sub health (亚健康). Sub health is a state between health and illness. Most of the sub healthy people
are middle-aged ones who are usually stressed out because of work and family. And some of them
are students who are having exams.
For example, you should get up early and go to bed early. And you should exercise regularly.
Exercising can keep you healthy. As for meals, it is better to eat less salt and sugar. Vegetables, fruit
and fish are important to your body. You should eat more of them. It is not good to eat too much at
one meal, because it may cause unhealthy changes in the digestive tract ( 消化道). And at last, a
balanced diet is very helpful in staying away from sub heath.
根据短文内容，选出最佳选项回答问题。
1. How may you feel if you're sub healthy?
A. Happy.
B. Comfortable.
C. Tired.
D. Sad.
2. According to the passage, who will probably be sub healthy?
A. Teachers and students.
B. Parents and children.
C. Middle-aged people and students.
D. The young and the old.
3. What should you do if you are sub healthy?
A. Relax and have good living habits.
B. Go to see the doctor and ask for some medicine.
C. Go to hospital in foreign countries.
D. Stay at home and not talk to others.
4. If you want to have good living habits,____.
A. you need to get up early and go to bed early
B. you should exercise very often
C. you should eat less salt and sugar and eat more vegetables, fruit and fish
D. All above.
5. What is the main idea of the passage?
A. What is sub health?
B. How to keep away from sub health.
C. How to keep sub healthy.
D. Why are you sub healthy
