________ construction is one whose distribution is functionally equivalent to that of one or more of its constituents, i.e., a word or a group of words, which serves as a definable Centre or Head.
离心结构（endocentric construction）由一组句法上相关的词构成，但其任何成分的功能都不与 这个词组作为一个整体时的功能相同，即该词组没有可定义的“核心”或“中心”。故选B。