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
玩中记英语四级单词207
玩中记英语四级单词222
背CET4核心词汇314
背CET4核心词汇308
背CET4核心词汇303
玩中记英语四级单词205
跟我背CET4核心词汇:arithmetic
跟我背CET4核心词汇:arbitrary
跟我背CET4核心词汇:stuff
跟我背CET4核心词汇:omit
玩中记英语四级单词213
背CET4核心词汇304
玩中记英语四级单词206
跟我背CET4核心词汇:resume
跟我背CET4核心词汇:burden
玩中记英语四级单词212
跟我背CET4核心词汇:enthusiasm
背CET4核心词汇307
玩游戏记英语四级单词:Earth Spiri大地之灵
玩中记英语四级单词198
跟我背CET4核心词汇:simplify
跟我背CET4核心词汇:principle
玩中记英语四级单词211
跟我背CET4核心词汇:massive
跟我背CET4核心词汇:geometry
玩中记英语四级单词197
跟我背CET4核心词汇:terminal
跟我背CET4核心词汇:marvelous
跟我背CET4核心词汇:temporary
玩中记英语四级单词204
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