单项选择题

The first paragraph suggests that both dreams and functions of dreams are

A．good to health.
B．bad to health.
C．unimportant in life.
D．of many types.
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单项选择题
We 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.
单项选择题
in a laughter clinic, doctors
A．laugh at their patients.
B．encourage their patients to laugh.
C．smile when they don't feel like laughing.
D．never stop laughing.
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