1.下面是一个用户自定义程序的调用的例子: Option Explicit Private Sub Command1_Click() Dim strS1 As String Dim strS2 As String strS1 = "ABCDEFG" MySub strS1, strS2 Print strS2 End Sub Private Sub MySub(ByVal str1 As String, str2 As String) Dim strT As String Dim i As Integer For i = Len(str1) To 1 Step -1 strT = strT Mid(str1, i, 1) Next str2 = strT End Sub 问:程序运行后,“print”语句的输出结果是什么?