单项选择题

Many people take part in marathons because they ______.

A．find the marathons very exciting
B．love traveling all over the country
C．want to keep fit
D．want to be good sportsmen
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单项选择题
Aerobics is a book about ______.
A．medicine
B．driving
C．exercise
D．marathon
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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