编写如下程序：Private Sub Form_Click() Print "Welcome！"End SubPrivate Sub Form_MouseDown(Button As Integer， Shift As Integer， X As Single， Y As Single) Print "欢迎！"End SubPrivate Sub Form_MouseUp(Button As Integer， Shift As Integer， X As Single， Y As Single) Print "热烈欢迎！"End Sub程序运行后，单击窗体，输出结果为( )。