易复发可恶变的颌骨囊肿是

A．根端囊肿
B．始基囊肿
C．含牙囊肿
D．角化囊肿
E．外渗性囊肿

Don't expect too much of his little son. After all, he is only a ______child of intelligence among his group.  [ ]

A. average    

B．slight

C．strange    

D．steady