— How about the concert last night?

— Well,   at least it's ________ the one I saw last time with Joan. [ ]

A. no worse than  

B. no good

C. not as good as  

D. as bad as

8086/8088系统中I/O端口地址是二进制数（）的，可寻址64K个端口。每个端口中含8位的数据。