来源于牙釉质的上皮细胞，感染或外伤等刺激可以成为诱因（）
A.始基囊肿
B.残余囊肿
C.牙源性角化囊肿
D.含牙囊肿
E.根侧牙周囊肿
参考答案：D
— He seems to be lost in thought. Why?
— Because the film _____his memories of his childhood.
A．calls up
B．picks up
C．brings up
D．takes up
著名的淝水之战，是由东晋______指挥作战的。
A．谢安
B．谢玄
C．苻坚
D．桓温
