Jack likes to make people _____ and play jokes _____ his friends.                                                            [ ]

A. laugh;on                                                        

B. to laugh;on                                                      

C. laugh;with                                                        

D. to laugh;with

鉴别中枢性和周围性瘫痪的依据包括（）

A.有无肌萎缩

B.有无病理征

C.腱反射改变

D.肌张力改变

E.有无节段性