单项选择题

The military authorities are seriously considering abandoning the expensive______plane.

A．three million dollars
B．three millions of dollars
C．three-million-dollar
D．three million-dollar
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单项选择题
The______is not always won by the fastest runner but sometimes by those who just keep running.
A．race
B．game
C．match
D．contest
单项选择题
Spend the extra dollars to maintain your equipment. Remember, you don't have to brush all your teeth either... only the ones you want to
A．take
B．keep
C．brush
D．leave
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