American elementary schools guide children's after-school reading by arranging daily reading assignments. There are reading assignments that must be completed from the first semester of grade one in primary school, and students in grade two must complete reading assignments for more than 15 minutes every day, and the daily reading time increases with grade. In addition to traditional libraries in schools and communities, many American primary school students also use Raz Kids Reading graded electronic audio library as a daily reading platform through accounts purchased by schools. Electronic libraries range from A to Z***24, and there is also an AA preparatory level. Each level is about 17 volumes, with moderate difficulty, diverse themes, refined words and strong interest; After reading the highest level, you can accumulate about 5000 words. Every electronic picture book and e-book is a combination of reading, listening, reading and answering. The design of questions focuses on guiding young readers to pay attention to and understand the main points of reading materials, and the difficulty of multiple-choice items is gradually increasing.