题干
He is boy.
A：a quite good
B：very a good
C：quite a good
D：so a good
答案(点此获取答案解析）
C
He is boy.
A：a quite good
B：very a good
C：quite a good
D：so a good
的右支上一点，且P到左焦点
与到右焦点
的距离之比为
，则P点的横坐标x=（ ）