用横线画出句中错误并改正。

1. Sorry, where's the camera?                                                      

2. What's a nice school bag!                                                    

3. Mum, where's cake?                                                    

4. I don't find Mum. Where's she?                                                    

女，51岁，半年多反复出现腰腿疼，行走时出现双小腿间歇性跛行。双小腿背外侧及足部麻、痛，下蹲片刻缓解，卧床不痛。双足及小腿外侧马鞍区痛觉稍减弱，双跟腱反射正常，足背动脉搏动存在，近2~3年糖尿病史。根据病史、检查所见最可能的诊断（）

A.椎间盘突出症

B.神经根管狭窄症

C.中央型腰椎管狭窄症

D.末梢神经炎

E.血栓闭塞性脉管炎