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?

　　A, It reduces the pain

　　B. It exercises the body

　　C. It improves the body's immune system

　　D. It can cure cancer

　　67.The writer's attitude towards laughter is _____

　　A .Critical

　　B. Doubtful

　　C. Positive

　　D. Negative

　　E

　　Winter begins in the north on December 22nd. People and animals have been doing what they always do to prepare for the colder months. Squirrels(松鼠), for example,

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