设在一个顶点周围有a个正四边形，b个正八边形，进行平面镶嵌，则a=____ ，b=____ ．

   All students need to have good study habits(习惯). When you have good study habits, you can learn things quickly. You also remember them easily. Do you like to study in the living-room? This is not a good place because it is usuallytoo noisy. You need to study in a quiet place, like your bedroom. A quiet place will help you only think about one thing, and you will learn better. Before you begin to study, do not forget to clean your desk. A good desk light is important, too. You are feeling tired easily if there is not enough(足够的) light.

那个人站在黄色安全线外，静静候车；那个人下车后轻咳了几声，把咳出的东西吐在手帕纸上丢进垃圾箱。周围人表扬他，他说“习惯而已”。由此可见习惯（    ）

孔子主张“对鬼神敬而远之”，荀子提出“制天命而用之”，董仲舒倡导“天人合一，天人感应”。对三者观点理解正确的是（    ）