Human language has two levels of structures, such as, units of the pri

Human language has two levels of structures, such as, units of the primary level are composed of elements of the secondary level and each of the two levels has its own principles of organization. Language is hierarchical. It indicates ______ of human language.

duality

cultural transmission

arbitrariness

cognitive creativity

答案及解析：本题考查语言的本质特征A选项，duality， “二重性”是指拥有两种结构组成的系统。一层结构为语音，低级结构；另一层结构为词，高级结构。综上，A选项正确。B选项，cultural transmission文化的传递性是指人类语言依靠文化或者人的教与学实现的，不体现，故排除。C选项，arbitrariness，任意性是指语言符号的形式与所表示的意义没有天然的联系，不体现，故排除。D选项，cognitive creativity，认知创造性，是人类语言的独一无二的特征。是指语言具有让它的使用者生成和理解新句子的特性。不体现，故排除。故正确选项为A。