题目

   Since last year, Where Are We Going,Dad? has become the most popular TV shows. On the show,the five fathers and their children traveled around China.riding camels through the western deserts,fishing on the east coast,and selling vegetables for their bus fare(费用)home in southwestern Yunnan province.    One dad doesn’t know how to do his daughter’s hair,so some people try to help him.Another one must survive(生存)with his son for three days in the desert.because the father can’t cook ,they only eat instant noodles(方便面).    Why is Where Are We Going,Dad? So pop已知是双曲线的左，右焦点，点在上，与轴垂直，,则E的离心率为（ ）（A） （B） （C） （D）2