简述需求差异定价有哪些形式。
参考答案:
1)以顾客为基础的差别定价;
2)以产品为基础的差别定价;
3)以地理位置为基础的差别定价;
4)以时间为基础的差别定价。
107. When he was very young, my chemistry teacher took _____ in reading detective stories.
A.happiness
B.delight
C.joy
D.Like
— Does he know how to work out the problem?
— Yes, he has _____ a good idea to solve it. [ ]
A. caught up with
B. kept up with
C. come up with
D. put up with