实现上述功能的VB程序如下，但加框处代码有错误，请改正。

  Dim a(1 To 15) As Integer

Dim n As Integer 'n为计数器

Dim key As Integer 'key存放筛选条件的数字部分

Dim f As String 'f存放筛选天健的符号部分：大于号或者小于号

Private Sub FormLoad()

Randomize

For i = 1 To 15

a(i) = Int(Rnd * 100)

List1.AddItem Str(a(i))

Next i

 End Sub

Private Sub Command1Click()

Dim c As Integer

Dim st As String

n = 0

c = Len(st)

f = Mid(st, 1, 1)

If f = "<" Then Se2 '调用过程

If f = ">" Then Se1 '调用过程

Label2.Caption = "有" + Str(n) + "个筛选结果"

End Sub

Private Sub Se1() '筛选过程1

For i = 1 To 15

   If a(i) > key Then

      List2.AddItem Str(a(i))

      n = n + 1

   End If

Next i

End Sub

Private Sub Se2() '筛选过程2

For i = 1 To 15

List2.AddItem Str(a(i))

       n = n + 1

    End If

Next i

End Sub

Dim a(1 To 10) As Integer, b(5 To 10) As Integer

a(1) = 71: a(2) = 73: a(3) = 90: a(4) = 79: a(5)  = 76

a(6) = 88: a(7) = 91: a(8) = 84: a(9) = 100: a(10) = 80

For i = 10 To 1 Step -1

  b((a(i) - 1) \ 10) = b((a(i) - 1) \ 10) + 1

Next i

该程序段运行后，数组元素b(7)的值是（  ）

为了实现此算法，图中判断框①和处理框②处可填入的是（  ）

a=1

b=a+1

print(a，b)