【单选题】用条件运算符定义一个过程 。正确的定义为()。 A. (define  ( abs  x )  (cond  ((x>0)  x) ((x=0 )  0) ((x<0 )  (-x)) )) ； B. (define  (abs  x)  (cond  ((>  x  0)  x) ((==  x  0)  0) ((<  x  0)  (-x)))) C. (define  ( abs  x) (cond  ((x>y)  (-x)) ((x=y )  0) ((x ； D. (define  (f  x  y)  (cond  (( ((=  x  0 )     0) ((>  x  0 )   (*  y  y)) ))

They went into the forest ____ the lost child. A: search for B: search C: in search of D: in search to

求最大值的函数是()。 A: min B: max C: cond D: abs

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