阅读下面一首古诗 , 按要求回答问题。
                                                                                                                  春  望 
                                                                                                                   杜甫
                                                                                                国破山河在，城春草木深。
                                                                                                感时花溅泪，恨别鸟惊心。
                                                                                                烽火连三月，家书抵万金。
                                                                                                白头搔更短，浑欲不胜簪。