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The discipline that studies the rules governing the formation of words into permissible sentences in languages is called s()
答案:
syntax
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Language is a system of a()vocal symbols used for human communication.
答案:
arbitrary
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D()is one of the design features of human language which refers to the phenomenon that language consists of two levels: a lower level of meaningless individual sounds and a higher level of meaningful units.
答案:
Duality
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