当主持人点击按钮“生成抽号”后，下方的标签会显示可抽取的学号姓名，一定时间后显示被抽取作为监票人的学号姓名。

'xxxss:学校学生数，kcq:可抽取

'xhxm:学号姓名，kcq:可抽取

Dim xxxss As Integer

Dim xhxm(3000) As String

Dim kcq(3000) As Boolean

'cq_Click:启用两个定时器

Private Sub cq_Click()

    cqxhxm.Enabled = True

    xskcqxhxm.Enabled = True

End Sub

Private Sub cz_Click()    '初始化数组kcq，使每个元素数据都处于可显示状态

  For i = 0 To xxxss - 1

    kcq(i) = True           '①

  Next i

End Sub

Private Sub xskcqxhxm_Timer()  '若数组kcq第x个元素处于可抽取状态，则显示数组xhxm第x个元素

    x = Int(Rnd * xxxss)

    If kcq(x) Then xhxmbq.text = kcq(x)     '②

End Sub

Private Sub Form_Load()  '从数据库中提取需要的学号姓名相关数据并初始化数组kcq

    Randomize

    xxxss = 0

    Dim conn As New ADODB.Connection,rs As New ADODB.Recordset

    Dim str_conn as String,str_sql As String

    str_conn = "driver=Microsoft access driver(*.mdb);DBQ="&app.path&"\school.mdb";

    conn.open str_conn

    str_sql = "select * from students"

    rs.open str_sql

    Do While Not rs.eof

      xxxss = xxxss + 1

      xhxm(xxxss) = rs.fields("xuehao")&rs.fields("xingming")

      rs.movenext

    Loop

    For i = 0 To xxxss - 1

      kcq(i) = True

    Next i

End Sub

Private Sub cqxhxm_Timer()    '决定抽取的学号姓名作为监票人

    xskcqxhxm.Enabled = False

    For i = 0 To xxxss - 1

        If xhxmbq.Caption = xhxm(i) Then kcq(i) = False

    Next i

    cqxhxm.Enabled = False

End Sub

①{#blank#}1{#/blank#} 

②{#blank#}2{#/blank#} 

Dim a(1 To 5) As Integer

t=0

For i = 1 To 5

  a(i) = Int(Rnd * 30 + 10)

  t = t + a(i) \ 10

Next i

For j = 1 To t \ 3

  If j Mod 2 = 1 Then a(j) = a(j) + 1 Else a(j) = a(j) - 1

Next j

运行程序后，数组a各个元素的值，不可能的是（  ）