单项选择题

In a laughter clinic, doctors

A．laugh at their patients.
B．encourage their patients to laugh.
C．smile when they don't feel like laughing.
D．never stop laughing.
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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.
单项选择题
The writer's attitude towards laughter is
A．critical.
B．doubtful.
C．positive.
D．negative.
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