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
人教版八年级英语上册--Unit 10 I’m going to be a basketball player.
初二年级英语课文 Module 9 Heroes
人教版八年级英语上册--Irregular Verbs
初二年级英语课文 Module 1 hobbies
人教版八年级英语上册--Review of units 1-6
外研版八年级英语上册课文翻译:Module 9
人教版八年级英语上册--Unit 8 How was your school trip?
人教版八年级英语上册--Unit 5 Can you come to my party?
牛津学案:7B Unit 4 Amazing things
新目标七年级英语上册期末复习资料
人教版九年级英语:Unit 4 What would you do?--3
外研版八年级英语上册课文翻译:Module 4
人教版八年级英语上册--Grammar
人教版八年级英语上册--Additional Material
外研版八年级英语上册课文翻译:Module 6
初二年级英语课文 Module 8 Public holidays
人教版九年级英语:Unit 4 What would you do?--2
外研版八年级英语上册课文翻译:Module 3
人教版八年级英语上册--Unit 11 Could you please clean your room?
初二年级英语课文 Module 7 Time off
外研版八年级英语上册课文翻译:Module 10
初二年级英语课文 Module 4 New technology
Unit 11 What time do you go to school?
外研版八年级英语上册课文翻译:Module 5
人教版八年级英语上册--Unit 7 How do you make a banana milk shake?
人教版八年级英语上册--Vocabulary Index
人教版八年级英语上册--Tapescripts
初二年级英语课文 Module 3 On the radio
人教版八年级英语上册--Review of units 7-12
外研版八年级英语上册课文翻译:Module 12
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英语教案 |
英语课件 |
英语试题 |
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上册 |
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