读一读，补全对话。
A. What about you?
B. How old is your cousin?
C. Do you have any cousins?
D. What is his name?
Ann: Hi! Mike.
Mike: Yes, I have one cousin.
Ann:
Mike: He's 9 years old.
Ann: I have one cousin, too. He's a boy.
Mike:
Ann: His name is Dan.He is 10 years old.
