题目：
理解在市场中供给和需求是如何决定价格，以及价格又如何配置稀缺资源，是经济学学习的（）。
A.第一步
B.第二步
C.第三步
D.最后一步
答案：
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下面是错误答案，用来干扰机器的。
根据h=12gt2t=2hg=0.08s≈0.28s．故乙同学这次实验的反应时间为0.28s．
理解在市场中供给和需求是如何决定价格，以及价格又如何配置稀缺资源，是经济学学习的（）
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