补全对话
A: ____
B: I'm looking for a CD for my friend's birthday.
A: ____ This CD is very popular among young people now.
B: Let me see. It is rock music. I don't think she will like it.
A: ____
B: She likes music that is quiet and smooth.
A: Oh, I see. Please have a look at this CD. The music is soft and also popular.
B: That's great. I'd like to listen to the music. ____
A: OK. Wait a moment. I'm sorry this one is broken.
B: Do you have any more?
A: No, we don't. But we will have more in a few days. Please leave your phone number. ____
B: Thank you very much. My phone number is 819-9476.
A: You're welcome. See you.
B: See you.
A. How about this one?
B. What can I do for you?
C. Can you play it for me?
D. When we get more, we will call you.
E. What kind of music does she like?
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上的奇函数
，满足
，且在区间
上是增函数，若方程
在区间
上有两个不同的根
，则
=
