在网络文学最初显示生机的时候，①____，这也导致后来崛起的网络作家对严肃文学同样极端不屑一顾。网络文学借互联网生活这个大势，到今天已经成为公众娱乐生活的主流：网络作家开始加入中国作协，传统文学报刊把网络文学纳入了评价体系，众多的严肃文学作家也纷纷触网，甚至开始尝试网络写作。②____，对网络文学的激烈批评也再难听到。出现这种情形，原因很简单，就是两大写作群体忽然间发现，③____：严肃作家创作的文学作品，网络作家写不来，网络作家所撰写的通俗奇幻长篇小说，传统作家也很难驾驭。
45÷9＝____
如果旁边稍有动静，意大利蟋蟀会（ ）
Many students take the school bus to school every day. Parents think taking the school bus is usually safe (安全的), but sometimes it is dangerous. Some students don't keep the school bus rules. What are the school bus rules?
Arrive at the bus station early.
Wait for (等候) the school bus at the bus station.
Don't run at the bus station.
Don't walk or fight on the bus.
Don't get off (下车) the bus when it goes.
化简：a-ba+b+a3+b3a-ab+b=____
