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
The interview took place around the kitchen table and was very causal.
A．formal
B．informal
C．regular
D．irregular
单项选择题
The government is debating the education laws.
A．discussing
B．defeating
C．delaying
D．declining
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