The interview of primary school mathematics teaching resources depends on 12 books from the first volume of primary school to the second volume of sixth grade. Version: People's Education Publishing House. You can read electronic textbooks online.
As long as it is the content in the book, it is possible to get it, including those marked with *, such as the course of chickens and rabbits in the same cage. So there is no question of which lesson is the key content. It is based on all courses and drawn by computer. Whether the questions drawn are simple or complicated depends on luck.
Good luck.