阅读古诗，回答相关问题。

                                                                                                                                          新晴
                                                                                                                                          刘攽
                                                                                                              青苔满地初晴后，绿树无人昼梦余。
                                                                                                              唯有南风旧相识，偷开门户又翻书。

国庆节，小明乘座旅游船游览了“百里乌江画廊”．旅游船在湖面上航行，小明坐在该旅游船的座位上．如果说他是静止的，则选择的参照物是（　　）