阅读下面这首唐诗，完成下题。

                                                                                                             卜算子

                                                                                                             张元幹

                                                                            风露湿行云，沙水迷归艇。卧看明河月满空，斗挂苍山顶。

                                                                            万古只青天，多事悲人境。起舞闻鸡酒未醒，潮落秋江冷。

[注]张元幹，宋代爱国词人