1. (2020高三上·浙江开学考) 某对分查找算法的VB程序段如下:

'数组元素f(1)到f(9)赋初值为0，代码略
Key = Val(Text1.Text)

i = 1: j = 9: flag = False

Do While i <= j And flag = False

  m = (i + j) \ 2

  f(m) = 1

  k = k + 1

  If a(m) = Key Then

    flag = True

  ElseIf a(m) > Key Then

    j = m - 1

  Else

    i = m + 1

  End If
Loop

整型数组元素a(1)到a(9)为升序序列，在文本框Text1中输入待查找数，执行该程序段后，f(1)到f(9)各元素值为“0,0,0,0,1,1,1,0,0”，则下列选项中描述正确的是 (    )