Dim a(1 to 10)as integer

Pos=-1

i=1

do while i<=10

   if i mod 2=0 then a(i)=i*2 else a(i)=i

   i=i+1

loop

i=10

do while i>=1

  if a(i)=12 then Pos=i

  i=i-1

loop

该程序段运行后，变量Pos值是（   ）

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(  )

Dim a(1 To 5) As Integer

a(1) = 1

For i = 2 To 5

    a(i) = Int(Rnd * 5) + 1

    If a(i) Mod 2 = 0 Then

         a(i) = a(i) + i

    Else

        a(i) = a(i) + a(i - 1)

    End If

Next i

a(1)~a(5)的值不可能的是（   ）