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.

Language

General linguistics is generally the study of language as a whole.

Human capacity for language has a g（）basis, but the details of language have to be taught and learned.

A diachronic study of language is the description of language at some point in time.

Language is a system of a（）vocal symbols used for human communication.

Syntax is different from morphology in that the former not only studies the morphemes, but also the combination of morphemes into words and words into sentences.

Modern linguistics regards the written language as primary, not the written language.

Chomsky defines “competence” as the ideal user’s k（）of the rules of his language.

Pragmatics