单项选择题

Cement was seldom used in buildings of the Middle Ages.()

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

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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
单项选择题
He made an immense amount of money in business.()

A. large
B. small
C. limited
D. little
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