在VB中，表达式321+54的运算结果是 (    )

A．375

B．“375”

C．“32154”

D．321+54

在当前行的第4列输出5个“*”

有如下Visual Basic程序段：
Dim a(1 To 7) As Integer, i As Integer, j As Integer, k As Integer, c As Integer
a(1) =" 3:" a(2) =" 9:" a(3) =" 1:" a(4) =" 5:" a(5) =" 8:" a(6) =" 6:" a(2) = 2
s = ""
For i =" 1" To 3
For j =" i" + 1 To 7
If a(j) < a(i) Then
k =" a(j):" a(j) =" a(i):" a(i) = k
c =" c" + 1
End If
Next j
s =" Str(a(i))" + s
Next i
text1.Text =" Str(c)" & “:” & s
该程序段运行后,文本框Text1中显示的内容是

A．5:6 8 9

B．3: 9 8 6

C．3:1 2 3

D．5:3 2 1

在VB中，设x=389，能得到其百位数字“3”的正确表达式是_______。

A．Int(x/10)*10

B．Int(x/100)*100

C．Int(x/100)

D．x-Int(x/10)*10

对下列程序段的说法正确的是（   ）
Private sub Command1_Click()
Dim s, i As Integer
s=0
i=1
For i="1" to 4  step 2
s=s+i^2
Next i
Print "s=";S
End Sub

A．该程序段执行后s的值为10

B．该程序段执行后s的值为30

C．该程序段执行后i的值为4

D．该程序段执行的结果为s=10