执行以下程序段 Dim i As Integer, x As nteger x = 0 For i = 20 To 1 Step -2 Next x = x + i \ 5 Print x 后，x的值为______。

A．Redim a As Integer
B．Static a As Integer
C．Public a As Integer
D．Dim a As Integer

A．Dim a As Variant　　a=Array(1,2,3,4,5)
B． Dim a(10) As Integera　　=Array(1,2,3,4,5)
C．Dim a%(10)　　a(1)="ABCDE"
D．Dim a(3),b(3) As Integer　　a(0)=0　　a(1)=1　　a(2)=2 b=a