补全下列对话。
A. My favourite colour is yellow. B. What's your favourite toy? C. My name is Tom. And you?
D. My favourite toy is a computergame. E. What`s your favourite colour?
L: Hello! What's your name?
T: ____
L: My name is Lili.
T: ____
L: My favourite toy is a doll. And you?
T:____
L: My favourite colour is red.
L:____
T:____
在
上是增函数且最小值是5，那么
上是（ ）
