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
In the United States, medical treatments are ______.
A．very effective
B．cheap
C．insufficient
D．expensive
单项选择题
The main reason for the rise in food prices is that ______.
A．people are buying less food
B．the government is providing less support for agricultural products
C．domestic food production has decreased
D．imported food is driving prices higher
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