设方程的另一根为x1，由x1+2-5=4，得x1=2+5．
将转向灯开关向上提，左转向灯亮。
下列数组声明正确的是( )。
A．n=5 Dim a(1 to n) As Integer
B．Dim a(10) As Integer ReDim a(1 To 12)
C．Dim a() As Single ReDim a(3,4) As Integer ReDim a(1 to n)As Integer
D．Dim a() As Integer n=5
