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Language is entirely arbitrary. ()

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The implementation of lexical insertion rules need to be subject to no restrictions.

Compared to phonetics, phonology is more concerned with the organisation of speech sounds in relation to the conveyance of meaning. ()

There is a three-word sentence stage in first language acquisition. ()

当客人退房时，服务员应（）。

A. 立刻为客人叫车
B. 进入客房检查
C. 向总台报告
D. 向大堂经理报告