Design features refers to the defining properties of human language that distinguish it from any（ ）system of communication.

The fact that different sounds are used to refer to the same object in different languages well illustrates the （） nature of language.

（）is one of the twelve design features proposed by Charles Hockett, which means that there is no logical connection between meanings and sounds. A good example is the fact that different sounds are used to refer to the same object in different languages.

Language system is （）, i.e.by teaching and learning, as opposed to genetic inheritance. 

（）is one of the twelve design features proposed by Charles Hockett, which means that language can be used to refer to things which are present or not present, real or imagined matters in the past, present, or future, or in far-away places.

（）is one of the design features of language, which means that language can refer to contexts removed from the immediate situations of the speaker.

It is the property of （）that provides speakers with an opportunity to talk about a wide range of things, free from barriers caused by separation in time and place.

Human language is not only genetically transmitted, but also （）transmitted while animal call systems are genetically transmitted.

Often referred to as a design feature of language, （） enables speakers to produce and understand an infinite number of sentences that they have neither spoken nor heard before.

Only human language has the feature of （）. Animal calls are mainly uttered in response to immediate changes of situation, i.e. , in contact of food, in presence of danger, or in pain. Once the danger or pain is gone, calls stop.

Language is not entirely （）, because there are words in every language that imitate natural sounds, such as rumble, crash, cackle and bang in English.

Although human beings are born with the ability to acquire language, the details of any languages system are not （）transmitted, but instead have to be taught and learned.

Language users can send messages which no one else has ever sent before, which results from （ ）of language.

In distinguishing language and parole, Saussure took a （）view of language，and his notion of language is a matter of social conventions.

The language behavior of particular persons on particular occasions is determined by many other factors over and above their linguistic （ ）

The grammar taught to learners of a language today is still basically （）in the sense that it tells learners what they should say or what is supposed to be correct usage.

（ ）linguistics refers to the study of a language or languages at a single point in time, without reference to earlier or later stages． 

（）linguistics refers to the linguistic study which aims to describe and analyze the language people actually use in communication. Modern linguistics is mostly descriptive.

（）grammars attempt to tell what is in the language while（） grammars tell people what should be in the language.

Modern linguistics, i.e., linguistic study carried out in the 20th century, is mostly （）.