题目：
If you often feel tired and the doctor can’t find anything wrong with you, you may be in a state of Subhealth (亚健康). Subhealth is a state between health and illness. Most of the subhealthy 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.
If you are subheahlty, it is not difficult for you to become well soon. You should have good living habits. 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 subhealth.
How may you feel if you’re subhealthy
A. Happy
B. Comfortable
C. Tired
D. Sad
答案：
参考答案：C
解析： 细节理解题。由文章首句，假如你常常觉得疲惫，且医生又不能检查出你身体有什么问题，你可能就处于亚健康状态了。可知答案为C。
