可能引起三叉神经痛的最常见病因是（）
A.三叉神经鞘瘤
B.胆脂瘤
C.外伤
D.血管压迫
E.炎症
参考答案：D
He________ six symphonies by the time he was 20.[ ]
A. wrote
B. has written
C. had written
D. writes
由牙板上皮剩余形成的，复发率高达5%～62%（）
A.牙源性角化囊肿
B.含牙囊肿
C.鼻腭囊肿
D.球状上颌囊肿
E.腮裂囊肿
