单项选择题

The main topic of the passage is ______.

A．laughter and physical exercise have similar effects on the human body
B．smile can produce the same effects as laughter
C．pain can be reduced by laughter
D．laughter is the best medicine

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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

单项选择题

The underlined word diminish can be replaced by ______.

A．test
B．stop
C．reduce
D．increase