单选题：The most pressing problem any economic system faces is how

题目内容：

The most pressing problem any economic system faces is how to use its scarce resources. A．puzzling
B．difficult
C．terrifying
D．urgent

参考答案：

答案解析：

What were the effects of the action she took?

What were the effects of the action she took?A．reasons B．results C．causes D．base

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Please don't refuse his help because he is so kind a man.A．turn down B．go down

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London quickly became a flourishing port.A．major B．large C．successful D．commerci

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The committee was asked to render a report on the housing situation,A．copy B．fu

分类：综合类题型：单选题