图1

Private Sub Command1 Click()

Dim a As Integer, b As Integer

a = 5: b = 8

b = a + b

label1.Caption = Str(b)

End Sub

引发此错误的语句可能为（   ）

Private Sub Command1_Click( )

   Dim  s  As  Integer

   Dim  I  As  Integer

   S=0

   For i=1 To 10

      s=s+i\7

   Next i

   Text1.text=str(s)

End sub

该程序段运行后，文本框Text1中显示{#blank#}1{#/blank#} 

Private Sub Command1_Click()

    Dim a As Integer, b As Integer

    Dim c As Integer                     '①

    a= Val(Text1. Text)                     '②

    b = Val(Text2. Text)

    c=a + b                             '③

    Label1. Caption ="a + b="+c        '④

End Sub