Private Sub Form_Click(  )

Dim x as Integer, n as Integer

 x=1

 n=0

Do While x < 20

    n=n+1

    x=x * 3

Loop

Text1.Text=Str(x)

Text2.Text=Str(n)

End Sub

①{#blank#}1{#/blank#}

②{#blank#}2{#/blank#}

Dim a(1 To 10) As Integer, b(5 To 10) As Integer

a(1) = 71: a(2) = 73: a(3) = 90: a(4) = 79: a(5)  = 76

a(6) = 88: a(7) = 91: a(8) = 84: a(9) = 100: a(10) = 80

For i = 10 To 1 Step -1

  b((a(i) - 1) \ 10) = b((a(i) - 1) \ 10) + 1

Next i

该程序段运行后，数组元素b(7)的值是（  ）

执行该流程图后，输出b的结果是（  ）

执行该算法，依次输入a的值2，5，4后，变量b的值为（  ）