题目

When I was young, I wished for a good car and a big house. That was my idea of success. I took all the advanced classes and tried to do well in the exams with my mind set on going to a key school. I just knew that I would somehow become famous and be able to afford the car and the dream house. All the way through junior years, my mind was planning this beautiful future. Then in the eleventh grade, many losses changed my mind. First, one of my friends died at 16. Soon after, my great-grandmother passed away, followed by my beloved fourth-grade teacher. These events left me not knowing wh函数y=x+1x-2（其中x＞2）的最小值为 （　　） A、2B、3C、4D、无最小值