题目

有如下程序： Private Sub Command1_Click() Dim a(5) as Integer Dim n as Integer, i as Integer n = Val(Text1.Text) i = 0 a(1) = 1 a(2) = 1 For i = 3 To na(i) = a(i-1) + a(i-2) Next i Label1.Caption = a(i) End Sub 若在Text1中输入5，则点击按钮后的运行结果为（ ） A . Label1中输出5 B . Label1中输出10 C . 报“下标越界”错误 D . Label1中无内容 答案：C已知sinα=，则tanα=________．