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The research on classification ability is more in kindergartens and more in primary schools. Research by cognitive psychologists has found that children under 0-1 years old basically have no classification ability, and they mainly rely on individual perception. The classification ability of children aged 1-3 has begun to sprout, but the concept of "category" has not yet formed. The classification of children aged 3-5 is basically still based on external perceptible dimensions such as shape and color. For example, children in small classes in kindergartens are asked to classify red plastic balls, red apples and bananas. They will divide the balls and apples together, either according to the shape (circle) or according to the color (red), but they will not put apple kernel bananas together according to the function (edible). What if you add another celery?@ hmily_2012 2019-04-08 10:24:45The JS code is as follows:Haziran有个好嗓子，尽管母亲反对仍要坚持唱歌，与此同时她爱上了知名歌手Aras，当她来到他的演唱会后命运被悄然改变…… ©沙拉特字幕组巍峨太行山，烽火连天处。中华好儿女，共同御外侮。1942年冬，太行山东麓河北保定曲阳县一带，风铃渡区小队与北平大学生在这里联手抗日，在战火中谱写了一首青春诗篇，留下了一段热血战士和青年学生的成长传奇。从八路军晋察冀军区大部队负伤回乡的刘大强，接到了曲阳县委梁书记的命令，担任风铃渡区小队队长。刘大强带领队员们潜入日军据点，杀死一名日本兵，抢了两支枪。梁书记狠狠批评了刘大强的冒险行动，让他将功补过，去完成一项新任务——到保定郊外接应从北平来的帮助八路军建立兵工厂的佟大川等大学生。风铃渡日军据点指挥官铃木也接到了全力消灭大学生的命令。日军疯狂追捕，区小队队员和大学生们伤亡惨重。皇族七王子被贬为县衙捕快之后，与同僚好友沈良、相爱之人邵月、宫女碧萝等帮助良善，惩奸除恶，最终挫败巨大阴谋的故事。