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

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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

解析本句话的意思：任何经济体系所面临的最至关紧要的问题是如何使用稀缺的资源。crucial“至关紧要的”和urgent“紧急的”含义最接近。puzzling意为“（使）迷惑的，（使）为难的”。terrifying意为“使感到恐怖的”。

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