题目

有如下VB程序段： s = “7218634594”：n = Len(s) t = 0 For i = 1 To n - 1  a(i) = Val(Mid(s, i, 2)) Next i For i = 1 To n - 2 Step 2 k = i For j = i + 2 To n - 1 Step 2   If a(j) < a(k) Then k = j Next j If k <> i Then   temp=a(i)：a(i)=a(k)：a(k)=temp     t = t + 1 End If Next i Text1.Text = Str(t) 该程序段运行后，文本框Text1中显示的内容是(  ) A . 1 B . 2 C . 3 D . 4 答案：B

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