题型：单选题 题类：常考题 难易度：普通
【bj】高中信息技术综合库——循环语句2
m = (1 + n) \ 2 ‘n为数组元素的个数，m为数组中间位置元素的下标
For i = 1 To n
If a(i) < a(m) Then t = a(i): a(i) = a(m): a(m) = t
Next i
p = m: q = m
For i = 1 To n - 2
If i Mod 2 = 1 Then
k = q + 1: q = q + 1
Else
k = p - 1: p = p - 1
End If
pos = k
For j = 1 To n
If 
And a(j) < a(k) Then k = j
Next j
If pos > k Then
t = a(pos): a(pos) = a(k): a(k) = t
End If
Next i
上述程序段方框处的代码为（ ）
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