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There is an old saying in English, “Laughter is the best medicine”. Until recently, few people took the saying very【小题1】. However, doctors have begun to study laughter and the effects(影响) it has on the human body. They have found the truth that laughter can really improve people’s【小题2】 Tests were carried out to study the effects of laughter on the body. People watched funny films【小题3】doctors checked their bodies. It was【小题4】that laughter has similar effects to physical exercise. If laughter exercises the body, it must be【小题5】. Other tests have shown that laughter also makes the body feel【小题6】painful. In one experiment , doctors produced pain in groups of students who listened to different radio programs. The group which listened to a funny program could bear the pain for the【小题7】time. As a result of these discoveries, some doctors in the United States now hold laughter clinics(诊所), in which they try to improve their【小题8】health by encouraging them to laugh. They have found that even if their patients do not really laugh,【小题9】them smile is enough to produce good effects similar to those caused【小题10】laughter.