题目

Who did the woman buy the shirt for?A.Herself. B.Her daughter. C.Her son. 答案：【答案】C【解析】【原文】W: I’d like to return this shirt, please. It is too small for my son. I would like to return it and buy this dress for my daughter instead.M: No problem, madam. Come this way, please.当k= 时，关于x的一元二次方程kx2-2（k+1）x+k-1=0的两个不相等的实数根x1，x2满足1x1+1x2=3．