19．A．subjectsB．sentencesC．rulesD．lessons

题目内容（请给出正确答案）

19．

A．subjects

B．sentences

C．rules

D．lessons

参考答案

考题 A communcitions protocal is a set of（）for exchanging information over a network.A．machine B．software C．rules D．hardware

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考题 Semantics is the study of( ). A.words B.sentences C.context D.meaning

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