如果直线l:y=kx﹣5与圆x2+y2﹣2x+my﹣4=0交于M、N两点,且M、N关于直线2x+y=0对称,则直线l被圆截得的弦长为( )
A:2
B:3
C:4
D:23
All the children like Mr. White very much because he often makes them _______.