填空题 "By 1is meant the property of having two levels of structures, such that 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. "
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【正确答案】 1、正确答案：duality    
【答案解析】解析：(考查语言的二重性)二重性指语言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。