It was ____ dark here ____I couldn't see anything.

如果m和n互为相反数，则化简（3m﹣2n）﹣（2m﹣3n）的结果是（　　）

阅读课外文言文，完成后面问题。
                                                                                                               措大①吃饭
                                                                                                                   苏轼
       有二措大相与言志，一云：“我平生不足惟饭与睡耳。他日得志，当饱吃饭了便睡，睡了又吃饭。”一云：“我则异于是，当吃了又吃，何暇复睡耶？”吾来庐山，闻马道士②嗜睡，于睡中得妙。然吾观之，终不及彼措大得吃饭三昧③也。  
                                                                                                                                                                                                                              （选自《东坡志林》）
注释：① 措大：指穷酸之士。  ②道士：道教的宗教职业者。  ③三昧：指事物的诀要和精义。

①水中蒸馏会导致原料焦糊②柑橘、柠檬芳香油易溶于水③会使芳香油的有效成分水解④所需实验装置复杂．