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

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

选项 A、puzzling
B、controversial
C、terrifying
D、urgent

答案D

解析本题要求找出pressing(紧急的、迫切的)的同义词，对比四个选项的意思A，puzzling“令人迷惑的”；B．controversial“有争议的”；C．terrifying“可怕的”；D．urgent“紧急的”，可选出D为最佳答案。

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