A: Between the ones that came before and the ones that came after.Q: Why were the Middle Ages called the Dark Ages?
以前,我们讨论过有关马车上一个人背袋子的问题,比下面的要复杂一些,但是,没有下面的有趣味。因为,下面的题目有变数,可以当脑筋急转弯来做!原题:在一辆公交车上有七个女孩,各个女孩有七个袋子,各个袋子里有七只大猫,各个大猫又生了七只小猫,问:公交车里面一共有多少条腿?