As an old saying goes，laughter is the best medicine.Until recently，few people took the saying very seriously.Now，however，doctors have begun to survey laughter and the effects it has on the human body.They have found evidence 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 muscle.It was found that laughter has similar effects to physical exercise.It increases blood pressure，the heart rate and the rate of breathing；it also works several groups of muscles in the face，the stomach，and even feet.If laughter exercises the body，it must be beneficial.
Other tests have shown that laughter appears to be able to reduce the effects of pain on the body.In one experiment doctors produced pain in groups of students who listened to different radio programs.The group which tolerates 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 endorphins （內(nèi)啡肽） in the brain.These are natural chemicals which decrease both stress and pain.
There is also some evidence to suggest that laughter helps the body's immune （免疫）system ，that is，the system which fights jye.aifection.In an experiment，one group of students watched a funny video while another group served as the control group-in other words，a group with which to compare the first group.Doctors checked the blood of the student in both groups and found that the people in the group that watched the video had an increase in the activity of their white blood cells，that is，the cell which fight infection.
As a result of these discoveries，some doctors and psychiatrists （精神病學(xué)家） in the United Stated now hold laughter clinics，in which 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.
（1）We can learn from the first paragraph that laughter AA.
A．is good for one's health
B．is related to some illness
C．has been surveyed long since
D．has no effect on the body
（2）Which of the following statements is NOT true of laughter，according to the passage？ DD
A．It reduces the pain.
B．It exercises the body.
C．It improves the body's immune system.
D．It can cure cancer.
（3）What is the text mainly about？ CC
A．Doctors have done many experiments.
B．Laughter can cure（治愈） many kinds of illnesses.
C．Laughter benefits our health.
D．Clinics to improve patients' condition are popular in America.
【答案】A；D；C
【解答】
【點評】
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發(fā)布：2024/5/27 14:0:0組卷：0引用：1難度：0.6
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