题目内容

_____

A. dumb
B. comb
C. bomb
D. absorb

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当需求富有弹性时,如果降低价格,则厂商的收益增加。()

三级差别定价是指垄断厂商把买者划分为两个或两个以上的类别,对每类买者收取不同的价格。()

Is this the first time you_____ New York?

A. have visited
B. would visit
C. visited
D. have been visiting

_____

A. search
B. heart
C. earnest
D. learned

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