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by 贺维芳

ebook

经过认真创作和编选，符合小学一年级孩子的心理和阅读能力，在快乐阅读的同时潜移默化地获得科学知识。为什么鱼的身上会有黏液？海胆是怎么走路的？蜻蜓为什么用尾巴点水？快来书中寻找答案吧！