291.
M: Hi, Ms. Rowling, how old were you when you started to write? And what was your first book?
W: I wrote my first book when I about six. It was about a small tiger. And I've been writing ever since.
M: Why did you choose to be an author?
W: Well, if you want to achieve happiness, step one would be finding out what you love doing most. Step two would be finding someone to pay you to do this. I consider myself very lucky to be able to support myself by writing.
M: Do you have any plans to write books for adults?
W: I suppose I might write 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.

答案解析：
(1) 正確答案為C。根據I wrote my first book when I about six. It was about a small tiger. 我六歲時寫的第一本書。那是關于一只小老虎的故事。可知，羅琳女士的第一本書是有關動物的，因此C項正確。
(2) 正確答案為A。根據I consider myself very lucky to be able to support myself by writing.我認為我能以寫作為生很幸運。可知，她認為她的幸運的原因是能以寫作謀生，因此A項正確。
(3) 正確答案為C。根據I've no idea where the ideas came from. 我也不知道點子來自哪里。可知，羅琳女士也不清楚《哈利·波特》故事的點子來自哪里，因此C項正確。