从方框内选择合适的句子完成下面的对话。
A. Please show me the white one.
B. Can I help you?
C. Yes. I like it.
D. I'll get a hat for her, too.
E. What color would you like?
A: ____
B: Yes. I want to buy a dress for my daughter. It's a birthday gift for her.
A: ____
B: Do you have a pink one? My daughter likes pink.
A: Yes. What about this one?
B: Yes, it's very nice. Do you have girls'hats?
____
A: Yes, here they are.____
B: ____
A: OK, here you are. It's nice, too.
，若
，则实数a的值为 （ ）