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The most urgent problem any economic system faces is how to use its scarce re...

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问题 The most urgent problem any economic system faces is how to use its scarce resources.
选项 A:puzzling       
B:difficult
C:terrifying       
D:crucial
答案D
解析urgent“紧急的”和crucial“至关紧要的”含义最接近。该句句意是：任何经济体系所面临的最至关紧要的问题是如何使用它稀少的资源o puzzling"（使）迷惑的、（使）为难的”;difficult“困难的”;terrifying"（使）感到恐怖的”。
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