Private Sub Command1Click()

  Dim a(-1 To 8) As Integer

  Dim i As Integer

  For i = -1 To 8

    a(i) = i * i

  Next i

  List1.AddItem Str (a(i))

End Sub

运行程序，单击命令按钮Command1后，出现的错误提示为

Dim a(1 to 5) as integer, i as integer, c as integer

a(1)=2: a(2)=1: a(3)=3: a(4)=4: a(5)=5

c=0

for i=3 to 5

 if a(i-2)+a(i-1) =a(i) then c=c+1

next i

text1.text = str(c)

该程序运行后，文本框text1中显示的内容是（   ）

实现该功能的程序代码如下：

Private Sub Command1_Click()

    Dim i As Integer，ch As String，s As String

    Dim my(0 To 127)As Boolean  ‘0～127表示128个ASCII字符的ASCII值

    s=Text1．Text

    For i=0 To 127

        my(i)=False

    Next i

    If    ①   then

        Text2．Text=”密钥长度不足26个字符!”

    Else

        For i=1 To 26

           ch=Mid(s，i，1)

           t=    ②    

           If my(t)=False Then

              my(t)=True

           Else

             Text2．Text=“密钥中有重复字符!”

             Exit Sub

           EndIf

        Next i

        Text2．Text=“密钥正确!”

    EndIf

End Sub

Private Sub Command1_Click()

Dim r As Single, s As Single            '①

r="10米"                     '②

s=3.14159*r*r            '③

Text2.Text ="某个半径为"+ Str(r)+"米的圆,其面积为"+ Str(s)+"平方米."             '④

End Sub

则程序中出错的语句是（   ）