Tests were carried out to study the effects of laughter on the body.People watched funny films while doctors checked their hearts，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 showed that laughter appears to be able to reduce the pain in the body.In one experiment doctors produced pain in the body of groups of students who listened to different radio programs.The group that tolerated(忍耐)the pain for the longest time was the group that listened to a funny program.________

　　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 prolong 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，the heart beating and breathing；it also works several groups of muscles in the faceve people’s health.

　　答案：1～5　FGDCB完形填空(2017·石家庄市高三模拟考试)If you want to stand out，there is no alternative but hard work.

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