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本书结合当前最新的知识理论,根据青少年的成长和发展特点,向青少年即全面又具有重点的介绍了宇宙、太空、地理、数、理、化、交通、能源、微生物、人体、动物、植物等多方面、多领域、多学科、大角度、大范围的基础知识。