A:2
B:4
C:233
D:433
一Doctor, is there anything wrong with my eyes?
一No. is OK.
当m=____ 时,关于x的方程(m﹣2)xm2-2+2x﹣1=0是一元二次方程.
你的妈妈在哪里上班?
____ ____your mother ____?