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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?老汉全不在意——这些来书院的老爷们都是一个样，他仔细又殷切地指了出村的路，又说出了村只有一条大路通往山边，到了郑家大门前，有牌子指引人往书院去，走不丢。　　此际，七金刚的成员只余下六位战士，他们誓言要替好友报仇，为国家舍命，为正义奋斗，联同倒戈相向的方盈，实行大破匪穴，于机关重重的大厦内进行垂死战。项羽拥有不小的野心，强大的气势和实力，但是他的心胸和智谋却不敢那么恭维。特八追问道：为什么，不守里面，偏偏要守外廓？京城城墙不过几里，装不下这么些人。前几天，陈启送来稿子。