Among the foreign invaders, became the ancestors of the English people（）
A. Romans
B. Anglo-Saxons
C. Danes
D. Normans
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There are roughly periods in British literary history（）
A. 6
B. 7
C. 8
D. 9
以下（）消息可以提供出错信息以及 IP 数据包处理情况给源点
A. TCP
B. UDP
C. ICMP
D. IGMP
The four basic literary forms include the following except（）
A. poetry
B. prose
C. opera
D. novels
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