朋友如打开的窗户，友情就是照射进来的阳光，朋友和友情是人生永恒的话题。下列选项中表达友情的诗句有（  ）
①海内存知己，天涯若比邻
②浮云游子意，落日故人情
③宝剑锋从磨砺出，梅花香自苦寒来
④桃花潭水深千尺，不及汪伦送我情

阅读下面古诗词，回答相关问题。
                                                                                                          留别王维
                                                                                                           孟浩然
                                                                                               寂寂竟何待，朝朝空自归。
                                                                                               欲寻芳草去，惜与故人违。
                                                                                               当路谁相假，知音世所稀。
                                                                                               只应守寂寞，还掩故园扉。
     【注解】当路，当权者。假，提携。