___ the real ancestors of the country（）
A. The Celts
B. Anglo-Saxon people
C. Romans
D. The Normans
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In 597,____from Rome brought Christianity to England（）
A. St. Augustine
B. Thomas Moore
C. Julia Caesar
D. King Alfred
A campus network belongs to（）
A. personal area network
B. LAN
C. MAN
D. WAN
The main function of transmitter in data communications system is（）
A. transmitting signal from source to destination
B. transmitting data from source to media
C. generating data to be transmitted
D. generating signal which is suitable to be transmitted in the communication system
IP protocol is located in the（）of TCP/IP architecture
A. application layer
B. transmission layer
C. internet layer
D. network access layer
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