"Well done, John! Not a single mistake____  in your exam paper this time!"said the teacher.  [ ]

A. you made          

B. did you make    

C. had you made    

D. you have made

下列不属于有机磷农药所致烟碱样作用的临床表现是（）

A.肌束震颤

B.动作不灵活

C.语言不清

D.瞳孔缩小