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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?他低头看了看自己手上的褶皱，拨开外衣摸一摸胸前的疤痕，这才发现，他忘记了一件重要的事情。那碗里冒着热气，顿时房里顿时就充满了特别的香味。为何班昭不用‘顺从，而用‘曲从呢？小葱眨眨眼睛。《勇往直前的我们》是2022年一季度湖南卫视重磅企划大型消防教育节目，聚焦平凡英雄、走入人间烟火，打开消防员们的世界去看不一样的热血青春。《你和我的警察课堂》是讲述比军队更残酷、比牢房更坚固的警察大学的年轻人们波澜壮阔的青春成长罗曼史电视剧。