题目

补全对话 A. I'm ten. B. It's a cake. C. Hello, Peter. D. happy birthday! E. How old are you? A: Hello,Mary. B: A: What'sthis?B:It's my birthday today. A: Oh, B: Thankyou. A: B: I'mnine. And how old are you?A: 答案：【1】C【2】B【3】D【4】E【5】A已知，A∈（0，），则 A.          B．         C．            D．