阅读下面的古诗，回答相关问题。

                                                                                    泊秦淮  

                                                                                     杜牧
                                                         烟笼寒水月笼沙，夜泊秦淮近酒家。

                                                         商女不知亡国恨，隔江犹唱后庭花。