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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?第二季紧接着第一季的故事发展下去。当Mike回到家的时候，他发现Zach劫持了Susan作为人质，他必须要找个办法来营救他们两个人。Wisteria Lane的新邻居Betty Applewhite是个钢琴演奏家，深藏在她心底的秘密如果被挖掘了出来呢？Bree认出了Rex的尸体，Rex的妈妈从葬礼回来后，差点把Bree要逼疯了。与此同时，Lynette参加了一个面试，Tom也同意留在家陪着孩子。.....Iterator pattern provides a way to access each element in a collection object sequentially without exposing the internal representation of the object, which can not only not expose the internal structure of the collection, but also allow external code to transparently access the internal elements of the collection. The specific structure diagram is shown below.那座新坟旁边倒是有许多脚印，可是昨晚至少有五人去过那坟地附近，早就踩烂了，根本分不清。疾风暴雨的拳头，欢呼与喧闹的看客，黑拳拳手王劲终于将对手击倒在地，迎接胜利的来临——然而，这只是十年前的往事……王劲与富家千金女程莹娟相恋并有了爱情的结晶——小飞，却被嫌贫爱富的莹娟父母拆散。为了承诺，王劲决定独立抚养儿子小飞，并决定与同样独自带着两个孩子的善良女人李金瓶忘记过去重新开始…… 　　但是，一场突如其来的车祸夺走了金瓶的生命，破坏了王劲与金瓶的幸福憧憬，还把三个年幼的孩子留给了一直艰辛挣扎的王劲，从此，小彬认为是王劲害死了他的妈妈，仇视王劲父子……。噩运并没有就此打住，十年前被王劲打败的泰国拳王因为年轻时的恩怨而找上了门，并拿出丰厚的赏金，王劲原想逃避，但好友大傻却为其出战而惨死，为了替大傻报仇，为了告诉孩子什么是责任，什么是承诺，王劲决定重新走上拳台……《火星异种》讲述了在21世纪中期，人类为了让火星变得更加适合居住，将用来改良环境的藻类以及适应性很强的蟑螂投放到了火星上。可是没想到这些生物却拥有了智慧，并且对人类展开了反击。该剧讲述了讲述了李英爱小姐在家庭、爱情和职场上所发生的故事。