Unlike radiation where each of the derived meanings is directly

Unlike radiation where each of the derived meanings is directly connected to the primary meaning, （ ）describes a process where each of the later meaning is related only to the preceding one like chains.
A、back-formation
B、concatenation
C、association
D、extension
【正确答案】：B
【题目解析】：词义发展有两种模式：radiation（辐射型）和concatenation（连锁型）。辐射模式以原始意义为中心，从原始意义发展而来的次要意义像射线一样四处散去，意义之间互不关联；连锁模式试试一个词的词义逐渐从原始意义连续转化。