TCP/IP协议的最高层等同于OSI协议的（）。
A.5-7层
B.6-7层
C.第7层
D.4-6层
参考答案：A
Mr. Smith's doctor suggested him_______ cold food these days. [ ]
A. not eat
B. not eating
C. not to eat
D. didn't eat
磁州窑的鼎盛期在（）。
A.唐宋
B.宋辽
C.宋金
D.元明
