诗歌赏析
                                                                                                 次北固山下
                                                                                                     王湾
                                                                                      客路青山外，行舟绿水前。
                                                                                      潮平两岸阔，风正一帆悬。
                                                                                      海日生残夜，江春入旧年。
                                                                                      乡书何处达? 归雁洛阳边。

宋仁宗皇佑四年（1052年）对夔州路的主客关系颁布的专法规定：“夔州路诸州官庄客户逃移者，并却勒归旧处，他处不得居停。又敕：施、黔州诸县主户、壮丁、寨将子弟等旁下客户逃移入外界，委县司画时差人计会所属州县追回，令著旧业。”材料说明此时（    ）