99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

<pre id="gqc1b"><strong id="gqc1b"></strong></pre>

填空題

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

答案： arbitrary

你可能感興趣的試題

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.

答案： Duality

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.

答案： abstract