图a

Private Sub Command1_Click()

  Dim a As Integer, b As Integer

  a = 10                                        '①

  b = 20                                        '②

  Text1.Text = "a+b=" + Val(a + b)              '③

End Sub                                         '④

For i=1 To 3

 k=i

 For j=i+1 To 6

  If a(j) > a(k) Then k=j

 Next j

 t=a(i):a(i)=a(k):a(k)=t

Next i

数组元素a(1)到a(6)的值依次为“8,2,9,3,5,1”，经过该程序段“加工”后，数组元素a(1)到a(5)的值依次为（  ）

from microbit import *

while True:

    if button_a.is_pressed():

        display.show(Image.HAPPY)

    elif button_b.is_pressed():

        break

    else:

        display.show(Image.SAD)

sleep(1000)

在micro:bit硬件支持下，以下说法正确的是 （    ）