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【单选题】
以下说明了边际效用情况的是
A.
吃了第二个面包,满足程度从10个效用单位增加到了15个效用单位,增加了5个效用单位
B.
吃了两个面包,共获得15个效用单位的满足程度
C.
吃了两个面包,平均每个面包带给的满足程度为7.5个效用单位
D.
以上都不对
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