有“虫眼”的蔬菜和水果，农药含量一定少．
若二次函数y=x2+bx+5配方后为y=（x﹣2）2+k，则b、k的值分别为（ ）
— Mom, I found that my book open on Jack's desk last night.
— Really? I couldn't believe that he to me yesterday.
