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 句意为：任何经济体系所面临的至关重要的问题是如何使用缺少的资源。crucial“至关紧要的”和urgent“紧急的”含义最接近。puzzling“(使)迷惑的”；terrifying“使感到恐怖的”。
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