a(1) = 2

For i = 2 To 3

  a(i) = a(i - 1) - Int(Rnd() * 2)

  If i Mod 2 = 1 Then

    a(i) = a(i) + 1

  Else

    a(i) = a(i) - 1

  End If

Next i

执行程序后，a(2)和a(3)的值不可能的是（   ）

Private Sub Command1_Click()

  Dim s As String, a As String, t As String

  s = Text1.Text: t = ""

  For i = 1 To Len(s)

    a = Mid(s, i, 1)

    If a >= "0" And a <= "9" Then

      t = t + a

    ElseIf a = "!" Then

      t = ""

    ElseIf t <> "" Then

      List1.AddItem t

    End If

  Next i

End Sub

在文本框Text1中输入“12+23=35!456Ye”，单击按钮“Command1”后，在列表框List1中显示的结果是（  ）

PRIVATE SUB FORM__CLICK( )

   S=0

  FOR A = 1 TO 5

    FOR B= 1 TO 3

    S=S+1

    NEXT B

  NEXT A

PRINT S

END SUB

For i = 1 To 6

a(i) = Int(Rnd * 10) + 1

Next i

For i = 2 To 6

If i Mod 2 = 0 And a(i)>a(i-1) Then

t=a(i)：a(i)=a(i-1)：a(i-1)=t

Else

a(i)=a(i)-1

End If

Next i

执行程序后，数组元素a(1)到a(6)的值可能是(  )

>>>  a=3

>>>  b=6

>>>  a, b=b, a

>>>  a-=b

>>>  a+b