题目

—Tom，I’m sorry co say that can’t go to watch tonight’s match with you, for I have to prepare for the coming exam．     —       ．Have some fun!       A．Don’t have too many in the fire．           B．Don’t be a wet blanket．       C．Don’t put the cart before the horse        D．Don，t pull my leg 答案：B19．抛物线y=ax2+bx+c的图象先向右平移3 个单位长度，再向下平移2 个单位长度，所得图象的解析式是y=x2-3x+5，则a+b+c=（　　）A．13B．11C．10D．12