最佳的商业区位能使付租后净利润达到最大。读某商业企业的地租、付租前利润与城市中心距离关系曲线图，回答下列各题。

下图中正确表示暖锋的图形的是．

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。