A:症结发怔挣外快旁征博引
B:媲美劈叉毛坯房无裨于事
C:整饬炽热赤卫队叱咤风云
D:禅让膻味扇耳光姗姗来迟
—___________, I have to look after my little sister. Maybe next time.
实数a,b在数轴上的位置如图所示,则下列结论正确的是( )