阅读下列材料，回答问题。

创新是一个民族进步的灵魂，是一个国家兴旺发达的不竭动力。创新包括制度创新、技术创新、文化创新及其他各方面的创新。中华民族自古以来 就有很多创造、创新和发明。

材料一：魏晋时代，世族势力强大，门第出身等于人才。于是造成“上品无寒门、下品无士族”的现象。……到了明清时期，考试形式和考试内容 的萎缩，一个个孔乙己、范进被批量生产；人才选拔制度陷入了僵化，成为 近代中国万马齐喑的重要原因。──钱穆

材料二：在粘土做的一个个小方块上刻出单字，再用火烧硬，成为陶字。排版时，在铁板上置一个铁框，将陶字排满一个铁框为一版。一版印刷的同时，可以排另一版，效率很高，印完一版后，陶字拆下可再用。

材料三：图一是唐朝新式农具

材料四：图二是某时期罗盘针模型图

材料五：图三是元朝疆域图

完形填空

Most American families are smaller than those in other countries. They have one or two （1）________ and one or two children each.

Children in the US will（2）________ their parents' house when they grow up. They usually live（3）________ their parents because of work. They often（4）________ to their parents or telephone them. And they often go to visit their parents when they are（5）________ vacation.

Parents usually let their children choose their（6）________ jobs. Americans think it's （7）________ for young people to decide their future by themselves.

Parents also （8）________ their children to do some housework at home. And in many families, children are paid for （9）________ housework. Parents think it can help them learn（10）________ to make money for their own use.

黄曲霉素（C₁₇H₁₂O₆）是污染粮食（大米、花生等）的真菌霉素，人类的特殊基因在黄曲霉素作用下会发生突变，危害身体健康．请回答：

（1）每个黄曲霉素分子中含有____ 　个原子；

（2）黄曲霉素的相对分子质量为____ 　；

（3）黄曲霉素分子中氢、氧元素的质量比为____ 　；

（4）黄曲霉素中氧元素的质量分数　____ 　．