阅读下面的诗歌 ，回答相关问题
                                                                                                     渡荆门送别
                                                                                                           李白
                                                                                         渡远荆门外，来从楚国游。
                                                                                         山随平野尽，江入大荒流。
                                                                                         月下飞天镜，云生结海楼。
                                                                                         仍怜故乡水，万里送行舟。

下面哪个点在函数y=$\frac{1}{2}$x+1的图象上（    ）

我国古代地方行政管理制度曾出现了从“分封制”到“郡县制”的变化，其变化的最主要原因是