单项选择题

The most pressing 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
Many fine cooks insist on ingredients (成分) of the highest quality.
A．demand
B．rely on
C．prepare for
D．create
单项选择题
Sally likes to tease her brother about his girl friends.
A．charm
B．laugh at
C．criticize
D．respect
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