key =Int(Rnd()*17+2)
i = 1: j = 9
Do While i <= j
m = (i + j) \ 2
If a(m) <= key Then i = m + 1 Else j = m - 1
Loop
Label1.Caption = str(i)
数组元素a(1)到a(9)的值依次为“2,4,6,8,10,12,14,16,18”,执行上述程序段后,在Label1中显示的内容不可能是( )