A:1111111
B:111111
C:1111101
D:1011111
Peter tried on three jackets, but _________ of them fitted him.
如图,顶点为A( 3 ,1)的抛物线经过坐标原点O,与x轴交于点B.
不等式x+3y-1<0表示的平面区域在直线x+3y-1=0的( )