The vocabulary and grammatical difference between British and American English are so trivial and few as hardly ________.
A. noticed
B. to be noticed
C. being noticed
D. to notice
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如果用户应用程序使用UDP协议进行数据传输,那么下面________必须承担可靠性方面的全部工作。
A. 数据链路层程序
B. 互联网层程序
C. 传输层程序
D. 用户应用程序
He ________ in the next room.
A. is often heard to sing
B. often heard to sing
C. is often heard sing
D. is often hearing to sing
When he was at school, literature was one of the()for them to learn.
A. matters
B. problems
C. questions
D. subjects
应用层DNS协议主要用于实现________网络服务功能。
A. 网络设备名字到IP地址的映射
B. 网络硬件地址IP地址的映射
C. 进程地址IP地址的映射
D. 用户名到进程地址的映射