单选题 以下程序段： Private Sub Form_Load( ) Dim Nop As Integer, Op As String * 1 Num1 = 3 Num2 = 2 Nop = val(Inputbox("请输入1-4之间的整数")) Select Case Nop Case 1 Op = "＋" Result = Num1 + Num2 Case 2 Op = "－" Result = Num1 - Num2 Case 3 Op = "×" Result = Num1 * Num2 Case 4 Op = "÷" Result = Num1 / Num2 End Select Label1= Num1 & Op & Num2 & "=" & Result End Sub 窗体运行后，输入2，则label1的标题显示结果为（ ）