使函数y=x2-3x+2的值为零的x的值为（ ）。
1，2
—Liu Yun, _____ this pair of glasses yours?
—No, my glasses _____ on the bookcase. [ ]
A. is ; is
B. are ; are
C. is; are
D. are ; is
虚喘的治疗要点是治
A．心B．肝C．脾D．肺E．肾
