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好了，好了。　　这是一部根据真实故事改编的打黑力作，取材于哈尔滨公安局打击以乔四为首的黑社会犯罪团伙的真实故事。顿时全都言笑晏晏，笑吟吟地用膳。What causes this problem?　　师徒四人重归于好，却又各自怀着心事，继续向西而去。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?