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【单选题】
Of all the major cities in the Midwest, which one is the region's most important city?
A.
Detroit
B.
Chicago
C.
Cleveland
D.
Indianapolis
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【简答题】下图所示的森林: (1) 求树(a)的先根序列和后根序列; (2)将此森林转换为相应的二叉树;
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【单选题】The figure illustrates the labor market for fast food restaurants in a small city in Peru. What would be the effects of a minimum wage imposed at $4 per hour?
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