∵2-3=12+3,2-1=12+ 1,2+3>2+1,
∴2-3<2-1.
故答案为<.
禁止利用个人专用地铁卡和AFC设备操作卡带人进出地铁()。
—I have a toothache.
—You should .
A.have a good sleep
B.see a dentist
C.drink hot water
D.play basketball