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问题 单项选择题

HHI指数的优势在于（）.

A.必须收集到该市场上所有企业的市场份额信

B.计算量不大

C.HHI对规模最大的前几个企业的市场份额变化反映特别敏感

D.便于收集资料

答案

参考答案：C

选择题

Don’t forget to         the lights before you leave the classroom.

A. turn on          B. turn off          C. turn up
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选择题

----Will you watch the World Cup match this year?

------No. I _________ several World Cup matches since I was a small child.

a. had seen  b. see

c. was seeing  d. have seen
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