题干
. —What fine weather! Would you like to go out for a walk?
—__________.
A：Look out.
B：What can I do for you?
C：That sounds a good idea.
D：I don’t agree.
答案(点此获取答案解析）
C
的左右焦点为
，线段
被抛物线
的焦点分成2：1两段，则双曲线的离心率为( )