牙源性角化囊肿的组织来源可能为（）
A.牙板上皮剩余
B.Serres上皮剩余
C.口腔黏膜
D.根尖肉芽肿
E.根尖脓肿
参考答案：A, B, C
_____ from his accent, he must be from Hunan.
[ ]
A. Judge
B. Judging
C. To judge
D. Judged
A类企业可以开展禁止类商品的加工贸易。 ( )
