B. By accident

　　C. While doing shopping in a store

　　D. Without difficulty

　　63.The author wanted to put her and her friend's names in the bracelet in order to _____.

　　A. Give her friend a big surprise

　　B. Make the present more special

　　C. Make her friend remember their friendship forever.

　　D. Remind her friend of their love between them.

　　D

　　There is an old saying in English: "laughter is the best medicine " until recently, few people took the saying very seriously. Now, however, doctors have begun to investigate laughter and the effects it has on the human body. They have found evidence that laughter really can improve people's health.

　　Tests were carried out to study the effects of laughter on the body. People watched funny films, while doctors checked their heart rate, blood pressure, breathing and muscle. It was found that laughter has similar effects to physical exercise. It increases blood pressure, the heart rate and the rate of breathing, it also works several groups of muscles in the face, the stomach, and even feet. If laughter exercises the body, it must be beneficial.

　　Other tests have shown that laughter appears to be capable of reducing the effects of a pain on the body. In one experiment doctors produced pain in groups of students who listened to different radio programs. The group which tolerate the pain for the longest time was the group which listened to a funny program. The reason why laughter can reduce pain seems to be that it helps to produce endorphins (内啡肽) in the brain. These are natural chemicals which decrease both stress and pain.

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