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 句子意思：任何经济制度下最为关键的是如何利用有限的资源。句子中scarce resources意为“稀缺资源”。选项puzzling意思是“使迷惑的”。urgent：紧急的。如：an urgent call，紧急电话。terrifying：使惊吓。例如：Rats terrifies me．我惧怕老鼠。difficult：困难的。如：a difficult task，难以完成的任务。
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