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当边际效用减少时,总效用一定是减少的。()

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_____

A. voyage
B. passage
C. teenage
D. usage

当边际效用减少时,总效用却可能是增加的。()

提示:星期五晚上有音乐会,Chris得到两张票,打电话给Linda,问她是否有空一同前往,并约她音乐会后一起吃饭。Linda听了非常高兴,两人相约六点四十五分在入口处见面。
Linda : Hello! This is Linda speaking.
Chris : Hello, Linda, this is Chris. 51 this Friday evening?
Linda : Yes, why ?
Chris:There’s a good concert,and I’ve 只ot two ticketsf I wonder___52___.
Linda:That’ s great! 53 ?
Chris:7 o’clock. But how about 54 at 6:45?
Linda :OK. I think I can make it.
Chris :After the concert, 55 , shall we?
Linda:Wonderful! Why don’t we go to a Chinese restaurant?
Chris:Why not? OK,see you Friday.
Linda :See you then. Bye!

商场对海南香蕉和进口香蕉制定不同的价格,这属于二级价格歧视。()

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