阅读理解。 Laughter is good for your health. When you laugh, several changes happen to your body. Your heart beats more slowly, your blood pressure goes down. You breathe more deeply, and so more oxygen (氧气) is carried round your body. Chemical changes happen too. Happy-feeling chemicals go to your head and make you feel that all is well in the world. The next time you laugh, notice that you are feeling relaxed afterwards. Doctors have studied the results of laughing with very sick patients. First, if a patient has a lot of pain, it is a good idea to watch funny films. One person with cancer described his stay in hospital.'After I laughed hard for ten minutes, the pain would go and I would have about two hours of pain-free sleep.' Laughing can help you get better, especially if you have a very bad illness. Again, chemical changes happen in the body. As a result the body fights the disease and may help the patient get better. But laughing is good for healthy people, too. Laughing helps people relax. If there is a problem and you are able to laugh about it, you may feel more relaxed. In Bombay in India there are 48' laughing clubs'. People meet and laugh together! They may laugh quietly or silently. When they laugh very strongly, this exercises the whole body. This is part of the Indian study of human health. So, next time, explain to your friends why you are laughing. 'It's keeping me healthy. Laughing is the best medicine, and they are no side-effects.' 1. What does the passage tell us about laughing? A. It only changes the body B. It only changes the mind C. It's good for the body and mind D. People laugh after they relax 2. What happens to very sick people? Laugher _______. A. usually helps people become healthy again B. stops diseases C. can stop the pain for a whole day D. can stop the pain for a short time 3. When is it a good idea to laugh? A. When your friend has a bad illness. B. When you feel relaxed. C. If someone else has a problem. D. If you have a problem. 4. Why do you think people go to Laughing Clubs in India? A. They are learning how to laugh. B. They think it keeps them healthy. C. They prefer laughing quietly or silently. D. They think it is better than exercise. 5. Which of the following is NOT true? A. Laughing helps people relax B. Laughing keeps people healthy C. Laughing stops people's diseases D. Laughing stops the pain for a short time