問題詳情：
As the old saying goes, laughter is the best medicine. 36 . However, doctors have begun to look into laughter and the effects that has on the human body. They have found that laughter really can improve people’s health.
37 . 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. It increases blood pressure, makes the heart beat quicker and makes people breathe deeper; it also works several groups of muscles (肌肉) in the face, the stomach, and even the feet. 38 .
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. 39 . The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemical in the brain which reduces both stress and pain.
40 . They try to improve their patients’ condition by encouraging them to laugh. 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. Therefore, people are taught to laugh.
B. Laughter is closely related to good health.
C. Until recently, few people took the saying seriously.
D. If laughter exercises the body, it must be beneficial.
E. Tests were carried out to study the effects of laughter on the body.
F. As a result, some doctors in the United States now hold laughter clinics.
G. The group that tolerated the pain for the longest time was the group which listened to a funny program.
【回答】
CEDGF
知識點：七選五題型
題型：未分類
