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by 代晓琴

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。哪里可以"早穿棉袄午穿纱，围着火炉吃西瓜"？真的有会发出声音的沙子吗？"胡杨泪"是怎么产生的？