The discipline that studies the rules governing the formation of words into permissible sentences in languages is called s（）

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

填空题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.

填空题Langue refers to the a（）linguistic system shared by all the members of a speech community while the parole is the concrete use of the conventions and application of the rules.

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

判断题The distinction between competence and performance was proposed by F. de Saussure.