Today is______ birthday.[ ]
A. he
B. he's
C. his
D. him
答案:C
牙龈呈轻度炎症,有颜色改变,无肿胀或血肿,探诊后有点状出血,SBI记分为()
A.0
B.1
C.2
D.3
E.4
概述中国奴隶制时代中止时段的几种主要分歧性观点。