单项选择题

It has been proved all of the following except that ______.

A．smiling does good to health
B．laughter can produce pain
C．there is a way to reduce pain
D．laughter can work the muscles in the feet
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单项选择题
The underlined word diminish can be replaced by ______.
A．test
B．stop
C．reduce
D．increase
单项选择题
The purpose of doctors holding laughter clinics is ______.
A．to give better condition to their patients
B．to improve patients' health
C．to make patients smile
D．to prove smile and laughter }lave the same effect
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