You can go there ____________, it's far from here.[ ]

A. on foot

B. by bus

在窗体上画一个名称为Command1的命令按钮和一个名称为Text1的文本框，然后输写如下程序：
Private Sub Command1_Click()
Dim x，y，z As Integer
x=5
y=7
z=0
Text1.Text=" "
CallFunl(x，y，z)
Text1.Text=Str(z)
End Sub
Sub Fun1(By Val a As Integer，Byval b As Integer，c As Integer)
c=a+b
End Sub
程序运行后，如果单击命令按钮，则在文本框中显示的内容是

A．0

B．12

C．Str(2)

D．没有显示