【正确答案】正确答案：Both the traffic light system and human linguistic system belong to the language system. Both can convey information to human beings. The key difference lies in duality. Linguists refer "duality"(of structure)to the fact that in all languages so far investigated, one finds two levels of structure or patterning.(3 points)At the first, higher level, language is analyzed in terms of combinations of meaningful units(such as morphemes, words, etc.). At the second, lower level, it is seen as a sequence of segments which lack any meaning in themselves, but combine to form units of meaning. With duality, our language is endowed with the great productive power.(3 points) The traffic light system does not have duality, because its primary level does not have independent units which can be united freely into meaningful secondary units. One form corresponds to one meaning. That is, the red light means to stop; the green one means to pass; the yellow one means to pause for pass or stop.(3 points)The traffic light system is more like animal communicative system rather than human language.(1 point)

【答案解析】解析：考查语言与交通信号灯的异同。语言系统与交通信号灯系统的关键区别在于语言的二重性。二重性是人类语言的区别性特征之一，指拥有两层结构的这种特性，底层结构是上层结构的组成成分，每层都有自身的组合规则。二重性使得人类语言具有巨大的能创性。而交通信号灯系统不具备二重性，在某种意义上，它更像是动物的语言。