试题题干
（）features refer to the defining properties of human language that distinguish it from any animal system of communication.
参考答案
正确答案：
试题解析
设计特征是指人类语言区别于任何动物交流系统的定义特性。
（）features refer to the defining properties of human language that distinguish it from any animal system of communication.
设计特征是指人类语言区别于任何动物交流系统的定义特性。