题目

若为各项均为正数的等比数列，且，则的值为 A. 3           B. 6          C. 9             D. 12 答案：B 解析:补全对话 根据上下文的意思，把下列对话补充完整。（共5个小题，每小题1分） A: 1.____________________________? B: Yes, please. I want a sweater for my daughter. A: Look! Here are some sweaters for girls.   2.____________________________? B: Size M. A: Do you like this red one? B: Yes. My daughter likes red best.  3.________________________? A: $25. B 4.____________________. Do you have any cheaper ones? A: How about this one? It’s only$18. B: Ok, I’ll take it. Here’s the money. 5._________. A: You’re welcome.