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  3. There is an English saying," Laughter is the best medicine." Until recently, few people took the saying seriously. Now, however,

There is an English saying," Laughter is the best medicine." Until recently, few people took the saying seriously. Now, however,

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问题     There is an English saying," Laughter is the best medicine." Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it bas on the human body. 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, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. It increases blood pressure, the heart beating and breathing; it also works several groups of muscles in the face, the stomach, and even the feet. 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. The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemicals in the brain which diminish both stress and pain.
    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. 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.
The main idea of the passage is ______.
选项 A、laughter and physical exercise have similar effects on the human body
B、smile can produce the same effects as laughter
C、pain can be reduced by laughter
D、laughter is the best medicine
答案D
解析 本题是对主题思想进行归纳的考查。其中关键词是main idea。解答这类题时不要过于具体或过于笼统，以免超出文章范围。要注意寻找文章的主题段或主题句(首尾句)。本，文第1段第1句Laughter．．．medicine，末句．．．can improve health点出论点，故D项是正确的。以后各段都是论证它的论据。至于其他各项由于内容过于具体而不能概括全文主题。
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