单项选择题

In 1861, it seemed inevitable that the Southern states would break away from the Union.

A．strange
B．certain
C．inconsistent
D．proper
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单项选择题
The police contended that the difficulties they faced were too severe.
A．argued
B．predicted
C．said
D．suggested
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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