单项选择题

The substance can be added to gasoline to accelerate the speed of automobiles.

A．quicken
B．shorten
C．loosen
D．enlarge
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单项选择题
He invested a considerable amount of money in the project.
A．immense
B．positive
C．powerful
D．realistic
单项选择题
The city has decided to do away with all the old buildings in its center.
A．get rid of
B．set up
C．repair
D．paint
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