题干
补全对话。
Anna: ____.
John: ____. Can I have a look?
Anna: ____. Here you are.
John: ____.
Anna: ____.
John: You are welcome.
A. Sure!
B. I have a nice cat.
C. Oh, really?
D. Thank you.
E. Oh! It's nice. I like it.
答案(点此获取答案解析）
B,C,A,E,D
，正项等比数列
满足
=1，则
（ ）