阅读下面这首古诗，然后回答问题。
                                                                                                       湖 上
                                                                                                      徐元杰
                                                                                   花开红树乱莺啼，草长平湖白鹭飞。
                                                                                   风日晴和人意好，夕阳箫鼓几船归。