初级

单选题According to Mr. Hall, what is opportunity cost?

参考答案：C进入在线模考
Hall机会成本下的定义是什么?对话中Hall先生提到“Opportunity cost is their relative value to buyers compared to the value of alternative good services on which they may want to spend that same amount of money．”机会成本就是用相同数额的钱购买其他同等价值的商品给购买者造成的相对价值差额。故选C。

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