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第一单元 植物
第一单元第一课 我们知道的植物
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354584801280/class/1343399354635132928
第一单元第二课 观察一棵植物
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354584801280/class/1343399354677075968
第一单元第三课 观察叶
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354584801280/class/1343399354727407616
第一单元第四课 这是谁的叶
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354584801280/class/1343399354773544960
第一单元第五课 植物是“活”的吗
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354584801280/class/1343399354819682304
第一单元第六课 校园里的植物
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354584801280/class/1343399354870013952
第一单元科学阅读 我们离不开的植物
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354584801280/class/1343399354916151296
第二单元 比较与测量
第二单元第一课 在观察中比较
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354958094336/class/1343399355008425984
第二单元第二课 起点和终点
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354958094336/class/1343399355054563328
第二单元第三课 用手来测量
https://www.29294.com/press/1343399608633794560/book/1343399354542858240/unit/1343399354958094336/class/1343399355104894976