改错。

1. Both you and your sister studies hard.                                     

2. Not only we but also she are going to the movies.                                      

3. Either he or I are to go.                               

4. Neither him nor his parents are coming.                                       

男，40岁，右侧面部痛并麻木1年，近3个月出现右耳听力下降，右侧咀嚼力弱，CT示右侧小脑脑桥角区类圆型占位病变，增强扫描病灶呈均一强化，双侧内听道无改变，脑干听觉诱发电位正常。最可能的诊断是（）

A.听神经鞘瘤

B.三叉神经鞘瘤

C.脑膜瘤

D.胶质瘤

E.表皮样囊肿