题目

完形填空。A teenage boy couldn't stand his parents' family rules，so he left home.He wanted to be __1__，but he had poor education and several years later，he had to ask for food on the street for a living.Now his mother has died.His father is an old man，but he is still looking __2__ his son.He has been to every corner of the city.Everywhere he goes，he __3__ a big photo of himself on the wall.At the lower part of the photo he writes，“I still love you...__4__ back home！”One day，the son saw one of the photos.The face was familiar.“Is that my father？”He moved closer an关于x的一元二次方程x2－（k＋1）x＋k－2＝0的根的情况是（　　）A．有两个相等的实数根B．有两个不相等的实数根C．没有实数根D．无法判断