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