单选题 ______ means 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.
【正确答案】 B
【答案解析】[解析] 二重性指语言在结构上存在两个水平(层次)，主要水平的元素是由次要水平元素组成的，同时两种水平的元素又有各自的组织原则。
本题考查常识。creativity创造力，创造性；duality二元性，两重性；arbitrariness任意性：displacement移位性。故选B。