Sub 第一题()
Dim rg As Range
Range("a1:c18").Select
For Each rg In Selection
If rg.Value > 0 Then rg.Value = "正数"
Next rg
End Sub
Sub 第二题()
Dim rg As Range
Range("a2:c12").Select
For Each rg In Selection
If rg.Value > 0 Then rg.EntireRow.Select
Next rg
End Sub