单项选择题

Aerobics is a book about ______.

A．medicine
B．driving
C．exercise
D．marathon
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单项选择题
The first paragraph indicates that medical workers ______.
A．are in great demand
B．make a lot of money
C．are concerned with their own health
D．like sports more than ordinary people
单项选择题
In the United States, medical treatments are ______.
A．very effective
B．cheap
C．insufficient
D．expensive
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