单选题 The sorting method described by the following code is called( ). FOR i:=1 TO n—1 do BEGIN k: =i; FOR j: =i+1 TO n DO IF A[j]＜A[K] THEN k:=j; IF k＜＞i THEN BEGIN x:=A[k]; A[k]: = A[i]; A[i]:=x END END;