无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

<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