编写一个VB程序，实现如下功能：在文本框text1中输入英文句子，单击“第1个最长单词”按钮，找到第1个最长单词并显示在文本框text2中。运行效果如图所示

为实现上述功能，请在画线处填入合适代码
Private Sub Command1_Click()
Dim s As String, m As String
Dim n As Integer, c As Integer, max As Integer, t As Integer
s = Text1.Text
n = Len(s)
c = 0
max = 0
For i =" 1" To n
m = ①  ‘截取字符串中的每个字符
If m >= "a" And m <= "z" Or m >= "A" And m <= "Z" Then
c =" c" + 1
Else
If c > max Then
max = c
t=" i" - 1
End If
c = 0
End If
If i =" n" Then
If c > max Then
max = c
t = i
End If
End If
Next i
Text2.Text = Mid(s, ② , max)
End Sub
（1） 程序中①处填入的代码是：  
（2） 程序中②处填入的代码是下列哪个选项（ ）

A．t

B．t-max

C．t-max+1

D．t-max-1

“删除字符”程序实现功能：在文本框Text1中输入待处理的字符串，在文本框Text2中输入需删除的单个字符，单击“删除”按钮Command1进行删除，并将删除后的字符串和被删除字符的位置分别显示在相应的文本框中。程序运行界面如下图所示。

（1）要使程序运行时，按钮Command1显示为“删除”，可在Form_Load事件处理过程中添加语句_____（单选，填字母：

A．Command1.Caption=“删除”/

B．Command1. font=“删除”/

C．Command1.Text=“删除”）。

（2）实现上述功能的VB程序如下，请在划线处填入合适的代码。
Private Sub Command1_Click()
Dim c As String, s As String, j As String
Dim n As Integer, i As Integer
Dim w As String, result As String
s = Text1. Text: d = Text2. Text
n = Len(s): w= “ ”: result = “ ”
For i = 1 To n
____________ 

w = w + Str(i) + “,”
Else

_____________

  End If
Next i
Text3. Text = result
Text4. Text = w
End Sub
（3）若将加框处语句“if c=d Then”修改为“if c<>d Then”，文本框Text1和Text2中输入如图所示，则执行程序后文本框Text3中输出的内容是___________。

在VB中，x=10，则执行下列语句的结果是print  "a=";a

A．a=10

B．a=a

C．10

D．10=10

下面的程序代码是通过函数求出二个整数型变量a、b中的较大值，其中所定义的函数名是（   ）
Function max(a, b As Integer) As Integer
If a > b Then max = a  Else  max = b
End Function
Private Sub Command1_Click()
Dim a As Integer, b As Integer, s as integer
a =" Val(Text1.Text):" b = Val(Text2.Text)
s =" max(a," b)
Text3.Text = s
End Sub

A．Command1_Click

B．function

C．max

D．max(a, b As Integer)

有如下VB程序段：
Private Sub Command1_Click()
Dim n As Integer, r As Integer, s As String
Dim t As Integer, k As Integer, v As Integer
n = 35: t = 0: k = 0
s = ""
Do While n > 0
r = n Mod 2
n = n \ 2
t = t + r
k = k + 1
s = Str(r) + s
Loop
s = Mid("0000000", 1, 7 - k) + s
v = t Mod 2
Text1.Text = s + Str(v)
End Sub
执行该程序段后，文本框Text1中显示的内容是

A．1 0 0 0 1 1 1

B．0 1 0 0 0 1 1 1

C．1 1 0 0 0 1 1

D．1 1 0 0 0 1 0 1