小飞准备出一期以“勿忘国耻”为主题的黑板报，下列选材不当的是[ ]
A．七七事变
B．南京大屠杀
C．西安事变
D．九一八事变
答案：C
I think you've _______ a mistake. It isn't my coat.[ ]
A. got
B. done
C. made
D. had
传统EDI文件传输，通常利用的网络是（）
A.VAN
B.Internet
C.Intranet
D.Extranet
