do procl with nl, n2 onl.n2 return procedure x,y x-x-y else 与y-x endif )105 C)-510do proc1 with n1,n2 ?n1,n2 return procedure x,y if x>y x=x-y else y=y-x endif endproc A) 10 5 B) -5 5 C) -5 10 D) 15 10