阅读下面这首诗，回答后面的题目。
                                                                                                                                            江  汉  
                                                                                                                                             杜甫
                                                                                                                             江汉思归客，乾坤一腐儒。
                                                                                                                             片云天共远，永夜月同孤。
                                                                                                                             落日心犹壮，秋风病欲苏。
                                                                                                                             古来有老马，不必取长途。