单项选择题

A．Headache.
B．Earache.
C．Toothache.
D．Stomachache.
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单项选择题
The price of natural gas is cheaper and more stable than that of gasoline.
A．Y
B．N
C．NG
单项选择题
More and more people are found of NGVs because they help reduce deaths in car accidents to a great degree.
A．Y
B．N
C．NG
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