— _____ did you see a cat run from behind the door?

— As soon as I entered the room.[ ]

A. What  

B. When    

C. Where  

D. Why

小脑幕切迹疝最有意义的临床定位体征是（）

A.患侧肢体活动减少或消失

B.对侧腹壁反射消失

C.患侧瞳孔散大

D.对侧肢体腱反射亢进

E.患侧下肢病理反射