There is also some evidence to suggest that laughter helps the body's immune (免疫)system , that is, the system which fights infection. 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 (精神病学家) 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.

　　64.We can learn from the first paragraph that laughter_____.

　　A. is good for one's health

　　B. is related to some illness

　　C. has been investigated long since

　　D. has no effect on the body

　　65. Doctors have found that laughter_____

　　A. keeps down blood pressure

　　B. has similar effects to physical exercise

　　C. decrease the heart rate

　　D. increase stress

　　66.Which of the following statements is NOT true of laughter, according to the passage?

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