25 cm by 17 cm. The book for children's classroom in the new century is an English textbook. Each level consists of 30 lessons, and each lesson revolves around a basic grammar point. The size of the textbook is 25cm× 17cm, and the contents of listening training and reading are placed on the left and right pages. This textbook is based on grammar and focuses on expanding daily vocabulary. Teaching, practice and writing training follow a set of well-designed basic procedures.