题目

有如下VB程序段：Dim c As String, i As IntegerDim s As String, s1 As Strings = "Jishu_Xuankao_2020"s1 =""For i = 1 To Len(s) Step 2  c = Mid(s, i, l)  If c >= "a" And c <= "z" Then s1=c+s1Next iText1. Text = s1执行该程序段后，文本框Text1显示的内容是（  ） A . okaus B . suako C . okus D . suko 答案：A

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