—Why don't you get a watch for your friend as a gift?
—But it's too expensive for me _______!
A:afford
B:affording
C:to afford
D:affords
东西半球的分界线是( )
下列关于生物群落的叙述,错误的是( )
如图,在平面直角坐标系中,已知点A(2,0),B(0,3),如果将线段AB绕点B顺时针旋转90°至CB,那么点C的坐标是( )