childrens numerical skills people appear to born to compute. The numerical skills of children develop so early and so inexorably that it is easy to imagine an internal clock of mathematical maturity guiding their growth. Not long after learning to walk and talk, they can set the table with impress accuracy---one knife, one spoon, one fork, for each of the five chairs. Soon they are capable of nothing that they have placed five knives, spoons and forks on the table and, a bit later, that this amounts to fifteen pieces of silverware. Having thus mastered addition, they move on to subtraction. It seems almost reasonable to expect that if a child were secluded on a desert island at birth and retrieved seven years later, he or she could enter a second enter a second-grade mathematics class without any serious problems of intellectual adjustment. Of course, the truth is not so simple. This century, the work of cognitive psychologists has illuminated the subtle forms of daily learning on which intellectual progress depends. Children were observed as they slowly grasped-----or, as the case might be, bumped into-----concepts that adults take for quantity is unchanged as water pours from a short glass into a tall thin one. Psychologists have since demonstrated that young children, asked to count the pencils in a pile, readily report the number of blue or red pencils, but must be coaxed into finding the total. Such studies have suggested that the rudiments of mathematics are mastered gradually, and with effort. They have also suggested that the very concept of abstract numbers------the idea of a oneness,a twoness , a threeness that applies to any class of objects and is a prerequisite for doing anything more mathematically demanding than setting a table-----is itself far from innate
下一篇: 历年英语六级写作真题及范文2008年6月
新概念英语第一册视频讲解 第137课:A pleasant dream美好的梦
新概念英语第一册视频讲解 第139课:Is that you, John?是你吗,约翰?
新概念英语第一册视频讲解 第117课:Tommy’s breakfast汤米的早餐
新概念英语第一册视频讲解 第121课:The man in a hat 戴帽子的男士
新概念英语下载/新概念英语MP3下载
新概念英语第一册视频讲解 第107课:It’s too small太小了
新概念英语第一册视频讲解 第127课:A famous actress 著名的女演员
新概念英语第一册视频讲解 第136课:He said that...
新概念英语第一册视频讲解 第134课:He told me that...
新概念英语第一册视频讲解 第130课:He must have been
新概念英语第一册视频讲解 第106课:I want you to..
新概念英语第一册视频讲解 第140课:He wants to know
新概念英语第一册视频讲解 第98课:Whose is it?
新概念英语第一册视频讲解 第102课:He says he...
新概念英语第一册视频讲解 第126课:Have to and do not need to
新概念英语第一册视频讲解 第138课:If...
新概念英语基础班、初级班、提高班、高级班
新概念英语第一册视频讲解 第129课:Seventy miles an hour时速70英里
新概念英语第一册视频讲解 第120课:It had already happened.
新概念英语第一册视频讲解 第99课:Ow! 啊哟!
新概念英语第一册视频讲解 第125课:Tea for two两个人一起喝茶
新概念英语第一册视频讲解 第124期:Who,which and that
新概念英语第一册视频讲解 第111课:The most expensive model最昂贵的型号
新概念英语第一册视频讲解 第112课:How do they compare?
新概念英语第一册视频讲解 第122课:Who,which and that
新概念英语第一册视频讲解 第141课:Sally’s first train ride萨莉第一交乘火车旅行
新概念英语第一册视频讲解 第110课:How do they compare?
新概念英语第一册视频讲解 第113课:Small change零钱
新概念英语第一册视频讲解 第104课:Too,very
新概念英语第一册视频讲解 第103课:The French test法语考试