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有如下VB程序段:
Dim a(l To 5) As Integer, i As Integer, c As Integer
a(1) = 2 : a(2) = 4 : a(3) = 6 : a(4)=36 : a(5) = 72
s=0
For i = 2 To 5
If a(i - 1) ^2 = a(i) Then s = s + a(i)
Next i
Text1.Text = Str(s)
该程序段运行后,文本框Text1中显示的内容是(   )
A.4B.6C.8D.40
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