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.
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单项选择题
Doctors have found that laughter
A．keeps down blood pressure.
B．has similar effects to physical exercise.
C．decreases the heart rate.
D．increases stress.
单项选择题
The writer's attitude towards laughter is
A．critical.
B．doubtful.
C．positive.
D．negative.
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