阅读下面的古诗，然后回答问题。                       
                                                                                                                                  过零丁洋
                                                                                                                                     文天祥
                                                                                                              辛苦遭逢起一经，干戈寥落四周星。
                                                                                                              山河破碎风飘絮，身世浮沉雨打萍。
                                                                                                              惶恐滩头说惶恐，零丁洋里叹零丁。
                                                                                                              人生自古谁无死？留取丹心照汗青。