13．There is an English saying，"（71）F"Until recently，few people took the saying seriously．Now however，doctors have begun to look into laughter and the effects it has on the human body．（72）G 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．（73）D 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．（74）C
（75）BThey 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．
分析 本文屬于說明文閱讀，作者通過這篇文章主要向我們描述了笑容對身體的影響，笑確實能改善人們的健康．
解答 71．F．推理判斷題．從前面的句子：have begun to look into laughter and the effects it has on the human body醫(yī)生開始研究笑以及對人類身體的影響，可知這句諺語跟笑有關．故選F．
72．G．推理判斷題．從前面的句子：doctors have begun to look into laughter and the effects it has on the human body．可知笑可以改善人們的健康．故選G．
73．D．推理判斷題．從前面的句子：It was found that laughter has similar effects to physical exercise．可知笑可知增加血壓，心跳和呼吸加快．故選D．
74．C．推理判斷題．從前面的句子：The group that tolerated（忍耐） the pain for the longest time was the group which listened to a funny program．可知笑可以減少疼痛的原因是會產(chǎn)生化學物質．故選C．
75．B．推理判斷題．從后面的句子：They have found that even if their patients do not really feel like laughing 可知醫(yī)生開笑聲診所幫助改善他們的狀況．故選B．
點評 七選五閱讀是完成性閱讀，和完形填空很類似，不同的是一個選詞，一個選句子．解題時，要注意上下文語境，充分考慮信息詞（選項中和空格前后句子中相同或相近的詞），選出最符合語境的句子
