2. 外语
  3. The most crucial problem any economic system faces is how to use its scarce resources.

The most crucial problem any economic system faces is how to use its scarce resources.

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问题 The most crucial problem any economic system faces is how to use its scarce resources.
选项 A、puzzling
B、difficult
C、terrifying
D、urgent
答案D
解析 题意：任何经济系统所面临的最关键的难题是如何利用有限的资源。划线词crucial意为“重要的，决定性的”。 ．A项puzzling意为：迷惑的，使莫名其妙的；例：His letter poses a number of puzzling questions．他的信中提出了许多令人困惑的问题。B项difficult意为：困难的，不随和的；例：Be careful．She is very difficult to deal with．可得当心，她很难对付。C项terrifying意为：令人恐惧的，骇人的；例：What a terrifying experience!多么可怕的经历啊!D项urgent意为：紧急的，迫切的；如：You seem to be unaware of how urgent the situation is．你好像没有意识到形势是多么的急迫。故选D。
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