患者8岁，因上前牙外伤牙折3个月就诊，查体：左上颌中切牙冠1／2缺损，穿髓，右上颌中牙左侧切角缺损约1／4牙冠，断面尖锐，未见露髓孔，冷刺激稍敏感

右上颌第一切牙最佳处理方法（）

A.观察

B.脱敏治疗

C.树脂充填

D.全冠修复

E.银汞充填

找错并改错。

( ) 1. She hasn't heard a letter from her friend for a long time.                                    

                      A                 B       C                           D

(     ) 2. I don't know why Kate hasn't replied my letter for half a month.                         

                                  A                       B                   C          D

(     ) 3. While feeling sad, I can't decide who to talk.                                                      

               A        B                                 C      D

( ) 4. Look, there are someone painting the wall in the fitting room.                               

               A         B                        C                             D

(     )5. Everyone of us considers Tom the cleverest boy in our class.                                 

                 A         B         C                       D