题目

阅读短文，选择正确答案。 Hello, my name is Xiaoyu. Hello，my name is Xiaoyu. I'm a pretty girl. There are four people in my family. I have long legs. My favourite sport is running. I run very fast. My brother is tall. He likes playing basketball. My father has long arms. He plays tennis very well. My mother is clever. She is good at playing chess. We are all good players. （1） There are _______ people in my family. A . five B . four C . six （2） My favourite sport is _______ because I have long legs. A . running B . playing basketball C . playing chess 已知椭圆，是其左顶点和左焦点，是圆上的动点，若，则此椭圆的离心率是