Martin looks so well. We've never seen him ______ so well before.
A:is looked
B:is looking
C:to look
D:look
下列物质能使溴水褪色且无沉淀生成的一项是( )
What _____ for dinner? ( )
如图所示,在平面直角坐标系中,有两点A(4,2),B(3,0),以原点为位似中心,A′B′与AB的相似比为12,得到线段A′B′.正确的画法是( )