–Which hair band do you like best, madam?–I can't decide now. I really don't know _________.
A:to choose which one
B:choose which one
C:which one to choose
D:which one I should choose it
下列句中加线的“为”字的意义不同于其他三项的一项是( )
下列示意图能够反映古代印度种姓制度的是( )
(1)计算2×6+27-3;(2)在平面直角坐标系中,已知点A(2,1),B(2,0),C(1,-1),请在图上画出△ABC,并画出与△ABC关于原点O对称的图形;(3)如图,AB是⊙O的直径,直线AC,BD是⊙O的切线,A,B是切点.求证:AC∥BD.