单项选择题

The most crucial problem any economic system faces is how to use its scarce resources.

A.puzzling
B.difficult
C.terrifying
D.urgent
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单项选择题
There is an abundant supply of cheap labor in this country.
A.steady
B.plentiful
C.an extra
D.a stable
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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