数组a中存放着1到20的正整数，要求对其中的元素进行分段排序，在Text2中输入每段元素的个数，在文本框Text3中显示每段降序排序后的数据，其中多余的元素不做处理，具体界面如图所示：

实现该功能的VB程序如下，请回答下列问题：
（1）要使程序运行时，窗体Form1标题显示“数组分段排序”，可在Form_Load事件过程中添加语句_______________(单选，填字母：

A．Form1. Caption=“数组分段排序”/

B．Form1. Text=“数组分段排序”/

C．Text1. Text=“数组分段排序”)。

（2）程序代码中的加框处有错误,请改正。
__________________________
（3）请在划线处填入合适的程序代码。
①________________________
②________________________
Dim a(0 To 100) As Integer
Const high = 16
Private Sub Form_Load()
For i = 1 To high
Randomize
a(i) = Int(Rnd ∗ 20) + 1
Text1.Text = Text1.Text + Str(a(i))
Next i
End Sub
Private Sub Command1_Click()
Dim p As Integer, q As Integer, t As Integer,m As Integer, n As Integer, k As Integer
m = Val(Text2.Text)
For i = 1 To ① 
c = ""
For j = 1 To m
p=j '改错
q = i ∗ m
k = sort(p, q)
If a(k) <> a(p) Then
t = a(p): a(p) = a(k): a(k) = t
End If
c = c + Str(a(p))
Next j
Text3.Text = Text3.Text + "" + c
Next i
End Sub
Function sort (f As Integer, g As Integer)As Integer
s = f
For i = f To g
If a(i) > a(s) Then
②   
End If
Next i
sort = s
End Function

对学生数据排序，排序后男生在前，女生在后，（“M”表示男，“F”表示女），男生和女生分别按“姓名”升序排序。编写一个VB程序，功能如下：在列表框list1中显示排序前学生数据，单击“排序”按钮Command1，在列表框list2中显示排序后的结果。程序运行界面如图所示。

实现上述功能的 VB程序如下，但加框处代码有错，请改正。
Const n = 10
Dim xm(1 To n)As String, xb(1 To n)As String
Function adj(sAs String, n As Integer) As String
'函数功能：在字符串 s 后添加若干个空格，使其长度变为 n，代码略。
End Function
Private Sub Form1_Load(   )
'读取 10 个学生姓名和性别分别存数组 xm、xb，
并在列表框 list1 中显示，代码略。
End Sub
Private Sub Command1Click
Dim i As Integer, j As Integer
i = 1
Do While i <= n - 1

j = n-1 '(1)________

Do While j >= i + 1

If xb(j) = "M" And xb(j - 1) = "F" Or xm(j) < xm(j - 1) Then '(2)________
temp = xm(j): xm(j) = xm(j - 1): xm(j - 1) = temp
temp = xb(j): xb(j) = xb(j - 1): xb(j - 1) = temp
End If
j = j - 1

Loop

i = i + 1

Loop
For i = 1 To n

List2.AddItem adj(xm(i), 12) + " " + xb(i)

Next i
End Sub

小李编写一个统计学生选考科目的 VB 程序，算法的基本思想是：检查每位学生选课组合的编码是否有效，对有效选择结果进行科目统计，根据各科占有效人数的百分率求出各科排名｡程序运行时，单击“显示”按钮 Command1，学生选课数据显示在列表框 List1 中，各科编号及对应科目名称显示在列表框 List2 中，单击“统计”按钮 Command2，选课结果按各科百分率由高到低显示在列表框 List3 中，程序运行结果如图所示｡

现上述功能的 VB 程序如下，请回答下列问题：
（1）学生选课的编码数据存储在数据表中，其字段名为__________________｡
（2）请在划线处填入合适的代码｡
Dim ach(1 To 500) As String  '存储各学生选课编码
Dim bno(1 To 10) As Integer '存储各科目编号
Dim bname(1 To 10) As String '存储各科目名称
Dim bnum(1 To 10) As Integer  '存储各科目被选次数
Dim bmc(1 To 10) As Integer '存储各科目被选的名次
Dim n As Integer, num As Integer
Private Sub Command1_Click()
Dim i As Integer, km As String
km = "物理化学生物政治历史地理技术"
Dim cn As New ADODB. Connection, rs As New
ADODB. Recordset, sql As String
cn. Open "provider=Microsoft. Jet. oledb. 4. 0;Data Source =" + App. Path + " \students. mdb"
rs. Open "select ∗ from choose", cn
Do While Not rs. EOF
n = n + 1 : ach(n) = rs. Fields("subject") : rs. MoveNext
Loop
rs. Close: cn. Close
Set rs = Nothing
Set cn = Nothing
For i = 1 To 7
bno(i) = i: bname(i) = Mid(km, (i - 1) ∗2 + 1, 2)
List2. AddItem Str (bno (i)) + " - - -" +bname(i)
Next i
End Sub
Private Sub Command2_Click()
Dim i As Integer, j As Integer, k As Integer
Dim c As String, per As Integer
For i = 1 To n
If check(ach(i)) =True Then
For j = 1 To 3
c = Mid(ach(i), j, 1)
bnum(Val(c)) = ①_________
Next j
num = num + 1
End If
Next i
i = 1
Do While i <= 7  '该循环得到各学科被选人数的名次
bmc(i) = 1
For j = 1 To 7
If bnum(j) > bnum(i) Then ②__________
Next j
i = i + 1
Loop
For i = 1 To 7
For j = 1 To 7
If ③_________Then
per = Int(bnum(j) ∗ 100 / num ∗ 100)/ 100
List3. AddItem Str(bno(j)) + "---" +bname(j) + "---" + Str(per) + "%"
End If
Next j
Next i
End Sub
Function check(s As String) As Boolean
'代码略，若学生选科代码有效，函数返回 True，否则返回 False
End Function

（加试题）小王要对字符串“welcome”进行重新排列，程序界面如图所示，则该程序执行后文本框 Text2 中显示的结果为（　　）

Private Sub Command2_Click()
　Dim a(1 To 7) As String
　Dim i, j, t2, m,cd As Integer
Dim s, t, p As String
　s = Text1.text
　cd=Len(s)
　For m = 1 To cd
　　a(m) = Mid(s, m, 1)
　Next m
　For i = 1 To 2
　　For j = cd To i + 1 Step -1
　　　If a(j) < a(j - 1) Then t = a(j): a(j) = a(j - 1): a(j - 1) = t
　　Next j
　Next i
For t2 = 1 To cd
　　p = p + a(t2)
　Next t2
　Text2.Text = p
End Sub

A．welcome

B．ceelmow

C．cewelmo

D．womleec