阅读下面一首诗，然后回答小题
                                                                                  闻王昌龄左迁龙标遥有此寄  （李白）
                                                                                              杨花落尽子规啼，

                                                                                              闻道龙标过五溪。

                                                                                              我寄愁心与明月，

                                                                                              随风直到夜郎西。