Fill in each of the following blanks with a word or an expression.
Human languages have such design features as productivity, discreteness, displacement, arbitrariness, cultural transmission, duality and  .

术语翻译题：将下列术语译成汉语。

ideational function

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interactional function 

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textual function

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Productivity 

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discreteness

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Cultural transmission

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Displacement

Judge whether each of the following statements is true or false. Write T for true (of the ten statements, only ONE is true) or F for false in the blank offered after each statement Give a correct version for each of the false statements

Interchangeability refers to the fact that human language can be used to talk about things that are present or not present, real or not real, and about matters in the past, present or future, or in far-away places.

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What are the design features of languages?

Judge whether each of the following statements is true or false.Write T for true(of the ten statements, only ONE is true) or F for false in the blank offered after each statement.Give a correct version for each of the false statements.

Cultural transmission refers to the ability that people have in making and comprehending indefinitely large quantities of sentences in their native language, including sentences they have never heard before. 

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arbitrariness

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Design feature

Judge whether each of the following statements is true or false. Write T for true(of the ten statements, only ONE is true) or F for false in the blank offered after each statement.Give a correct version for each of the false statements.

Interchangeability refers to the fact that language is culturally transmitted.

Ferdinand de Saussure points out that all linguistic phenomena contain two parts: langue and （）.

（）is the father of modern linguistics.

（）language can be equally communicative even when they do not accompany language.

​We need to consider briefly the communicative value of body movements - the study of which has recently come to be called（）

A（） relation is a relation between a linguistic element in an utterance and linguistic elements outside that utterance, but belonging to the same sub-system of the language.