参考答案：six

解析：[听力原文] 5-8
M: Hi, Miss Rowling, how old were you when you started to write And what was your first book
W: I wrote my first story when I was about six. It was about a small animal, a rabbit, I mean, and I’ve been writing ever since.
M: Why did you choose to be an author
W: If someone asked me how to achieve happiness, step one would be finding out what you love doing most and step two would be finding someone to pay you to do this. I consider myself very lucky indeed to be able to support myself by writing.
M: Do you have any plans to write books for adults
W: My first two novels were for adults. I suppose I might write another one, but I never really imagine a target audience when I’m writing. The ideas come first, so it really depends on the ideas that grasp me next.
M: Where did the ideas for the Harry Potter books come from
W: I’ve no idea where the ideas came from. And I hope I’ll never find out. It would spoil my excitement if it turned out I just have a funny wrinkle on the surface of my brain, which makes me think about the invisible train platform.