有如下VB程序段: s1 = "algorithm" If Len(s1) Mod 2 = 1 Then i = Len(s1) \ 2: j = Len(s1) \ 2 + 2 s2 = Mid(s1, i + 1, 1) Else i = Len(s1) \ 2: j = Len(s1) \ 2 + 1 End If Do While i >= 1 If Mid(s1, i, 1) > Mid(s1, j, 1) Then s2 = Mid(s1, i, 1) + s2 Else s2 = s2 + Mid(s1, j, 1) End If i = i - 1: j = j + 1 Loop Label1.Caption = s2 执行该程序段后,标签Label1上显示的内容是( )
A . lortm
B . rotlm
C . mltor
D . lormt
答案:A