1. (2021·浙江模拟) 有如下VB 程序段：

For i = 1 To 7

  a(i) = Int(Rnd * 9) + 1

Next i

s = 0

For i = 1 To 6

  If a(i) < a(i + 1) Then

    f(i) = 1

  ElseIf a(i) > a(i + 1) Then

    f(i) = -1

  Else

    f(i) = 0

  End If

  s = s + f(i)

Next i

执行该程序段后，变量s的值为0，则数组a各元素的值可能是（   ）