Blackbriar English Reading abcde difference: the difficulty coefficient of learning is different. ReadingA-Z Primary English Graded Reading Introduction: This course involves 22 topic-based graded readings on "City, Animals, Festivals, Stories, Camping, Birthday Party" and contains about 600 commonly used vocabulary words, which allow students to master special question words such as "where, when, how, why" by training words, phrases and sentence patterns with the help of scene animations. This course covers 22 topics of graded reading, including "cities, animals, festivals, stories, camping, birthday parties", etc. It contains about 600 commonly used vocabulary words, and allows students to improve their listening, speaking, reading and writing skills through the training of vocabulary, phrases and sentence patterns, and through the use of scene animations to master the usage of special question words, such as "where, when, how, why," as well as expressions of the day of the week, address, weather, hobbies, etc.