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

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

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问题 15. The most pressing 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
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