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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?　　热血宣言：控诉世间的不公不义...等等！这一次咱们伺候他们，等下回咱们受伤了，就该他们伺候咱们了。北京的牢笼与远方的子孙给了她双重的折磨，郁郁之中，面上已经生出了皱纹，沉默寡言。ViewGroup and View's onTouchEvent methods handle events, so this event can only be handled in two ways:嬴子夜有些愕然地看着尹旭，诧异道：依兰姐都把断水赠送与你，怎么？你对她全无了解？尹旭摇头哂道：哪里，赠送断水与我，是为了答谢彭蠡泽救命之恩。