高塔再沸器温度.（）。

A．<50℃

B．>45℃

C．>50℃

D．>60℃

编写如下事件过程： Option Base 1 Private Sub Form Click()Dim x1()As IntegerDim i As IntegerDim s As IntegerReDim x1(3)For i = 1 To UBound(x1) x1(i)=i + 1Next iCall sub1(x1)For i = 1 To UBound(x1) s = s + x1(i)Next iPrint s End Sub Private Sub sub1(n()As Integer)Dim i As IntegerReDim Preserve n(5)For i = 3 To 5 n(i)=n(i-1)*2Next i End Sub 程序运行后，单击窗体，则窗体上显示的内容是

A．6

B．12

C．24

D．47