题目

Because of the support from all over the country, beautiful new buildings             here and there in the earthquake - hit areas in Sichuan.A. can see      B. can be seen    C. will be seen 答案：B解析:略已知二次函数y=x2-4x+5．（1）将y=x2-4x+5化成y=a（x-h）2+k的形式；（2）指出该二次函数图象的对称轴和顶点坐标；（3）当x取何值时，y随x的增大而增大？