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P93 能力提升题1，”UI设计必备技能“页面

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P94 能力提升题2，”筛选酒店信息“页面

Sophia Stella, a 1___ at Columbia’s School of Engineering, is one of many undergraduates who become involved, one way or another, in research 2_ at the university. Some do it for academic 3_, some for money, some just for experience. Students and professors agree that an undergraduate research 4_ can be uniquely 5________ to both parties.

总效用达到最大值时，边际效用为（）

A. 小于0
B. 等于0
C. 大于0

基数效用论用来分析消费者行为的工具是。