Traversing the Myriad Realms from the Long Dynasty

One day, Ji Yan suddenly transmigrated. Facing this fact, he was very calm. Knowing that he was about to become a free worker in a sweatshop, he was still very calm. But, when he found out that to become a Reincarnator, he still had to take a written exam, and after the written exam, there was even an interview, he couldn't remain calm, a 'damn it' was already stuck in his throat. But, when he saw the first exam question, he went crazy. PS: Speaking of which, what is the longest river in Europe?