一凡文具店每天上午8时开始营业，下午7时停止营业，每天营业____时。

阅读下面这首古诗，完成两小题。
                                                                                                              齐安郡中偶题
                                                                                                               （唐）杜牧
                                                                                           两竿落日溪桥上，半缕轻烟柳影中。
                                                                                           多少绿荷相倚恨，一时回首背西风。
                                                                                                             暮热游荷池上
                                                                                                            （宋）杨万里
                                                                                             细草摇头忽报侬，披襟拦得一西风。
                                                                                             荷花入暮犹愁热，低面深藏碧伞中。

秦始皇创立的皇帝制度，既是对前朝制度的否定，也受到了前朝制度的影响，它们是（    ）

①禅让制 ②王位世袭制 ③分封制 ④嫡长子继承制