Meets the objectives of the study, the developmental characteristics of children in various age, culture meets nature. Traditions and national identity, the content of the story, old enough to help teach students how to think. And have made progress in all areas, in line with the daily lives of the students, the better course. Be achieved with the cooperation of all parties, the better course. Must be flexible, depending on the circumstances and the course is required for students to learn and so on. And sort of difficulty is not to be disconnected from each other.
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