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
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单项选择题
According to the passage, the author's tone about exercise can be described as ______.
A．enthusiastic
B．objective
C．optimistic
D．critical
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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