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by 杨发兴

ebook

青少年在成长过程中总会遇到许许多多的疑问，许多的事物对于他们来说都是新奇未知的。本书内容丰富广博，涉及一个学生应知必知的每个知识学科，脉络非常清晰，是以小学生的理解程度为标准编写而成的，能有效地帮助孩子建立起对整个世界的认识。