第三部分   第二节（共5小题；每小题2分，满分10分）
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
There is an English saying: “laughter is the best medicine.” Until recently, few people took the saying seriously.     71 __ They have found that laughter really can improve people’s health.
Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their heart rate, blood pressure, breathing and muscles.     72   
73     In one experiment doctors produced pain in groups of students who listened to different radio programs.       74      The reason why laughter can reduce pain seems to be that it helps to produce a kind of natural chemical in the brain which diminishes both stress and pain.
As a result of these discoveries, some doctors in the United States now hold laughter clinics.   ___75     Also 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．The group that tolerated pain for the longest time was the one that listened to a funny program.

B．It was found that laughter has similar effects to physical exercise.

C．Laughter is reported to be a good medicine to the patient.

D．They help to improve their patients’ condition by encouraging them to laugh.

E.Now however, doctors have begun to investigate laughter and the effects it has on the human body.
F.Other tests have shown that laughter appears to be able to reduce the effects of pain on the body.
G.The more you laugh, the healthier you are.