已知a²-a+5=0，则（a-3）（a+2）的值是______．

在窗体上画一个名称为、commonDidog1的通用对话框，一个名称为Command1的命令按钮。要求单击命令按钮时,打开一个保存文稿件的通用对话框。该窗口的标题为”Save",缺省文件名为”SaveFile",在“文件类型”栏中显示*.txt,则能够满足上述要求的程序是

A．Private Sub Command1_Click( )
CommonDislog1.FileName="SaveFile"
CommonDialog1.Filter="All Files|*.*|(*.txt)|*.txt|(*.doc)|*.doc"
CommonDialog1.FUterlndex=2
CommonDialog1.DialogTitle="Save"
CommonDi810S1.Action=2
End Sub

B．Pnrate Sub Command1_Click( )
CommonDialog1.FileNamc="SaveFile"
CommonDialog1.Filtcr="All Files|*.*|(*.txt)|*.txt|(*.doc)|*.doc"
commonDislog1.Filterlndex=1
CommonDialog1.DialogTitle="Save"
CommonDialog1.AcUon=2
End Sub

C．Private Sub Command1_C1ick( )
CommonDialog1.FileName="Saven"
CommonDislog1.Filter="All Files|*.*I(*.txt)I*.txt(*.doc)1*.doc"
CommonDislog1.Fiterlndex=2
Commondislog1.DialogTide="SaveFile"
CommonDialog1.Action=2
End Sub

D．PnvateSubCommarldl_C1ick( )
CommonDialog1.FUeName="SaveFile"
CommonDialog1.Filter="All Files|*.*I(*.txt)|*.txt|(*.doc)|*.doc"
CommonDialog1.Filterlndex=1
CommonDialog1.DislogTitle="SaveFile"
CommonDialog1.Achon=1
End Sub