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.
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单项选择题
The writer's attitude towards laughter is
A．critical.
B．doubtful.
C．positive.
D．negative.
单项选择题
Which of the following statements is NOT true of laughter, according to the passage
A．It reduces pain.
B．It exercises the body.
C．It improves the body's immune system.
D．It can cure cancer.
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