Dim a As Integer, b As Integer, c As Integer, y As Integer

a=3:b=4:c=4

If a<=b And c<=a Then

  y=a+b

ElseIf a<=b or b<=c Then

  y=b+c

ElseIf b=c Then

y=a mod c

Else

  y=a+b+c

End If

该程序段运行之后，变量y的值为（   ）

x=25: y=20

If  x>y  Then

       y =y+20

       If  y>50 Then y=y^2

Else

       y=y^2

       y=x+y

End  If

Label1. Caption=Str(y)

该程序段执行后，标签Labell中显示的内容是（  ）

n = 6

d(1) = 23: d(2) = 31: d(3) = 19: d(4) = 33: d(5) =58: d(6) = 28

k = Abs(d(2) - d(1))

For i = 3 To n

 If Abs(d(i) - d(i - 1)) > k Then k = Abs(d(i) - d(i - 1))

Next i

Text1.Text = Str(k)

上述程序段执行后，文本框Text1显示的内容是（  ）