若采用选择排序算法对其进行从大到小排序，则第二趟的排序结果是（   ）

For i = 1 To 2

k = i

  For j = 6 To i + 1 Step -1

    If a(j) > a(k) Then k = j

  Next j

  If k <> i then

    t = a(i) : a(i) = a(k) : a(k) = t

  End If

Next i

数组元素a(1)到a(6)的值依次为“71,46,31,58,29,78”，经过该程序段“加工”后，数组元素a(1)到a(6)的值依次为（  ）

Dim a(1 To 10) As Integer

Private Sub Command1 Click()

Dim i As Integer, j As Integer, x As Integer p = True

i = 1

    Do While i <= 9 And p p= False

    For j = 10 To i + 1 Step -1

        If  Then    '①

            k = a(j): a(j) = a(j - 1): a(j - 1) = k: p = True

        End If

    Next j

    i = i + 1

Loop

For i = 1 To 10

    List2.AddItem Str(a(i)) Next i

End Sub

Private Sub Form_Load()

Dim i As Integer

List1.Clear

Randomize         '初始化随机函数 Rnd

For i = 1 To 10

    a(i) =     '②

List1.AddItem

Str(a(i))

Next i

End Sub

①{#blank#}1{#/blank#} ②{#blank#}2{#/blank#} 

Const n = 10

Dim a(1 To n) As Integer

Private Sub Command1_Click()

Dim i As Integer, j As Integer, t As Integer

Dim bottom As Integer

'获取排序前数据依次存储在数组a中，并在文本框Text1中显示。代码略

bottom = n

i = 1

Do While i <= bottom - 1

   For j = bottom To i + 1 Step -1

      If  Then  {#blank#}1{#/blank#}

         t = a(j): a(j) = a(j - 1): a(j - 1) = t

      ElseIf a(j) = a(j - 1) Then    '相邻两个数据相等，进行剔除处理

            {#blank#}2{#/blank#}

         bottom = bottom - 1

      End If

   Next j

   i = i + 1

Loop

Text2.Text = " "

For i = 1 To bottom

   Text2.Text = Text2.Text + Str(a(i))

Next i

End Sub

Dim flag(0 To 4) As Boolean, p As Integer

For i=1 To 4

    flag(i)=False

Next i

i=1: flag(0)=True

Do While i <= 4 And flag(i-1)

    For j=5 To i+1 Step-1

        If a(j)<a(j-1) Then

            k=a(j):a(j)=a(j-1):a(j-1)=k

            flag(i)=True

        End If

    Next j

    i=i+1

Loop

数组元素a(1)到a(5)值依次为“16，4，24，33，77”，程序运行后，flag数组中为True个数及i的值分别是（   ）

lst = [2,5,2,1]

y = [1,1,1,1]

n = len(lst)

for i in range(①____):

    for j in range(②____):

        if ③____:

            y[j] = y[j] + 1

        else

            y[i] = y[i] + 1

上述程序段3个划线处的表达式分别为（   ）