阅读下面的诗，完成小题。
                                                                                         酬乐天扬州初逢席上见赠
                                                                               巴山楚水凄凉地，二十三年弃置身。
                                                                               怀旧空吟闻笛赋，到乡翻似烂柯人。
                                                                               沉舟侧畔千帆过，病树前头万木春。
                                                                                今日听君歌一曲，暂凭杯酒长精神。