单项选择题

Why is laughter generally believed to be the best medicine

A．Because it keeps people away from falling ill.
B．Because it is an effective way to cure patients.
C．Because it increases the content of oxygen in blood.
D．Because it helps patients recover more quickly.
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单项选择题
Laughter can be a way of body exercise if people ______.
A．laugh much more than they do in everyday
B．laugh much louder than they do in everyday
C．receive special training in how to laugh
D．learn to laugh while doing other exercises
单项选择题
The negative emotions stored inside will ______.
A．do harm to physical health
B．have bad influence on psychology
C．be let out through laughter only
D．fade away as time goes on
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