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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?After the death sentence, Liu Guiduo's parents cried and told reporters, "If only everyone on board could swim like fish."　　女人不哭，代表了我们共同走过的这三十年……Double Difference Analysis and Strategic Goal Design (STEP 1-STEP 2): BLM is a method that starts with "gap" and ends with making up for "gap". This is the main line of business strategic planning. The generation of gap comes from the expectation of the top management of the enterprise for future goals. Undoubtedly, the strategic objectives of the business line mainly come from the decomposition of the company-level strategic objective system.刘冲是警校毕业的高材生。因为枪法奇准，同学和队友送他一个外号叫“刘一枪”。分到刑警队不久，队长给刘冲找了一个师傅：支队副队长马关。人到中年的马关从警已近二十个年头。最近几年来，马关不时产生一种辞职经商的冲动。毕竟这些年来因为自己当警察付出的太多，父子之间十几年的隔阂暂且不说，因为当警察，几次交女，女方都因为承受不起长期的担惊受怕而提出分手，以至于马关人到中年了还光棍一根。可真下了决心，等到跟队长提出来时，马关又开不了那个口。此时，一系列离奇的谋杀案接踵而来，死者都是向警方提供过黄克强线索的人。大案当前，刘冲又回到马关身边。经过马关和刘冲的仔细勘察分析，最终将犯罪嫌疑人锁定在黄克强的哥哥黄克武身上。据调查，黄克武离开本市已经十年有余，这次回来很可能就是冲着弟弟的事而来的。还没来得及等马关采取行动，黄克武已经抢先一步向刘冲的女友于真下了毒手。痛失女友的巨大打击，一时间让刘冲对自己所从事的职业和前途表现出极度的茫然。关键时刻，是马关支撑起刘冲活下去的信心，并一步步将刘冲带回到对案情的侦察当中。