多选题Which of the following is not a design feature of human language?多选题Modern linguistics is mostly prescriptive, but sometimes descriptive.多选题A scientific study of language is based on what the linguist thinks.多选题Linguistics is generally defined as the scientific study of language. （ ）多选题In the study of linguistics, hypotheses formed should be based on language facts and checked against the observed facts. （ ）简答题Modern linguistics is different from traditional grammar.多选题The details of any language system are passed on from one generation to the next through _______, rather than by instinct. ( )多选题Modern linguistics regards the written language as primary, not the spoken language. （ ）多选题A historical study of language is a _______ study of language. ( )多选题If a linguistic study describes and analyzes the language people actually use, it is said to be _______.