Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their heart, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise.【3】 If laughter exercises the body, it must be beneficial.

Other tests have shown that laughter appears to be able to reduce the effect of pain on the body. In one experiment doctors produced pain in groups of students who listened to different radio programs. The group that tolerated the pain for the longest time was the group which listened to a funny program. 【4】

【5】They have found that even if their patients do not really feel like laughing, making them smile is enough to produce beneficial effects similar to those caused by laughter.

A.Laughter can surely last one's life.

B.As a result of these discoveries, some doctors in the United States now hold laughter clinics, in which they help to improve their patients' condition by encouraging them to laugh.

C.The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemical in the brain which diminishes both stress and pain.

D.It increases blood pressure, makes the heart beat quicker and makes people breathe deeper; it also works several groups of muscles in the face, the stomach, and even the feet.

E.They have proved that laughter can really cure any disease if people keep a good state of mind.

F.Laughter is the best medicine.

G.They have found that laughter really can improve people's health.

【答案】

【1】F

【2】G

【3】D

【4】C

【5】B

【解析】

这是一篇说明文。本文介绍了欢笑确实对身体健康有益处。人们发现笑与身体运动有相似的作用，欢笑能改善人们的健康，笑能增加血压、心脏跳动，还能锻炼面部、胃部甚至足部的肌肉群。而笑能减轻疼痛的原因似乎是笑会产生一种减轻压力和疼痛的化学物质。

【1】

根据下文的Now however, doctors have begun to look into laughter and the effects it has on the human body.(但是，现在医生已经开始研究笑，以及它对人体的影响)可知，本文主要讲述笑和健康的关系，故此次用F. Laughter is the best medicine.(笑是最好的药)符合文意，且这也是一句英语谚语，故选F项。

【2】

上文Now however, doctors have begun to look into laughter and the effects it has on the human body.(但是，现在医生已经开始研究笑，以及它对人体的影响)与G. They have found that laughter really can improve people's health.(他们发现笑真的可以改善人们的健康)承接自然，上文提到研究，选项给出研究结果，且选项的they就是上文的doctors，故选G项。

【3】

上文It was found that laughter has similar effects to physical exercise．(人们发现笑与身体运动有相似的作用)与D. It increases blood pressure, makes the heart beat quicker and makes people breathe deeper; it also works several groups of muscles in the face, the stomach, and even the feet.(它能增加血压、心脏跳动和呼吸，还能锻炼面部、胃部甚至足部的肌肉群。)承接自然，选项所陈述的内容就是笑和体育运动相似的效果，且选项中的it就是上文的laughter，故选D项。

【4】

上文Other tests have shown that laughter appears to be able to reduce the effect of pain on the body. (其它一些测试表明笑似乎能够降低疼痛对身体的影响)与C. The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemical in the brain which diminishes both stress and pain.( 笑能减轻疼痛的原因似乎是笑会产生一种减轻压力和疼痛的化学物质)承接自然，上下文话题一致，reduce是关键词，故选C项。

【5】

下文They have found that even if their patients do not really feel like laughing，making them smile is enough to produce beneficial effects similar to those caused by laughter．(他们发现，即使他们的病人真的不想笑，让他们微笑也能产生类似于笑所产生的有益效果。)与B. As a result of these discoveries, some doctors in the United States now hold laughter clinics, in which they help to improve their patients' condition by encouraging them to laugh.( 由于这些发现，一些在美国的医生建立了笑诊所，在那里他们通过鼓励他们的病人笑来改善他们的病情)承接自然，上下文话题一致，且下文的they就是选项提到的doctors，patient是关键词，故选B项。