物体在月球上受到的重力是它在地球上受到的重力的1/6，一中学生在地球上的重力是588牛，当他到月球上时，其质量是(      )

    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 subhealthy, 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（有规律地）. 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（远离）subhealth.