题目

下面VB程序段运行后，文本框Text1和Label1显示的内容分别是（  ） Private Sub Command1_Click()   Dim y As Long   Text1.Text = ""   y = f(3)   Label1.Caption = Str(y) End Sub Function f(n As Integer) As Long     Text1.Text = Text1.Text + Str(n)     If n <= 1 Then        f = 1     Else        f = f(n - 1) + 2     End If End Function A . 3 2 1和5 B . 1 2 3和5 C . 5和3 2 1 D . 6和3 2 1 答案：A

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