单项选择题

The retired army officers gave him money

A．to show they were most generous.
B．to show they were most respectable.
C．to hide their confusion.
D．to show they were rich.
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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.
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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