单项选择题

The passage mainly discussed that ______.

A．laughter ard 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

The students who ______ tolerated the pain for the longest time.

A．listened to different radio programs
B．could produce a kind of chemical
C．don't have stress or pain
D．listened to a funny program

单项选择题

The word diminish in Line 14 means ______.

A．test
B．stop
C．reduce
D．increase