单项选择题

There is an abundant supply of cheap labor in this country.()

A. steady
B. plentiful
C. extra
D. stable

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单项选择题
Cement was seldom used in buildings of the Middle Ages.()

A. slight
B. rarely
C. originally
D. occasionally
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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