For i = 1 To 6
x = Int(Rnd * 10) + 1
If i Mod 2 <> x Mod 2 Then
a(i) = x
Else
a(7 - i) = x
End If
Next i
数组a各元素的初始值为0,执行程序后a数组各元素的值不可能是( )