阅读下列这首诗，完成题目。
                                                                                                 谢亭送别
                                                                                                    许浑
                                                                             劳歌一曲解行舟，红叶青山水急流。
                                                                             日暮酒醒人已远，满天风雨下西楼。
【注】①劳歌：送别歌。