“学生成绩”表含有字段(学号，姓名，数学，外语，专业，总分)。下列程序的功能是：计算每名学生的总分(总分=数学+外语+专业)。请在程序空白处填入适当语句，使程序实现所需要的功能。
Private Sub Command1_Click()
Dim cn AS New ADODB．Connection
Dim rs AS New ADODB．Recordset
Dim zongfen As New ADODB．Fileld
Dim shuxue AS New ADODB．Fileld
Dim waiyu AS New ADODB．Fileld
Dim zhuanye As New ADODB．Fileld
Dim strSQL As Sting
Set cn=CurrentProjeet．Connection
StrSQL="Select*from成绩表"
rs．OpenstrSQL，cn，adOpenDynamic，adLockptimistic，adCmdText
Set zongfen=rs．Filelds("总分")
Set shuxue=rs．Filelds("数学")
Set waiyu=rs．Filelds("外语")
Set zhuanye=rs．Filelds("专业")
Do while______
Zongfen=shuxue+waiyu+zhuanye
______
rs．MoveNext
Loop
rs．close
cn．close
Set rs=Nothing
Set cn=Nothing
End Sub
