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牛津深圳版英語七上74theworldofnumbers之四(編輯修改稿)

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【文章內(nèi)容簡(jiǎn)介】 system of numbers. They then invented the zero. The invention of the zero helped people write big numbers and calculate more easily. Now use each of these ten numbers once to write the biggest is it? （數(shù)字體系）（由 … 組成）（印度人）（發(fā)展）（ invent. v. invention n. inventor n.） 9876543210 Numbers: everyone’s language Calculating machines (計(jì) 算工具） one of the first calculating machines was an abacus. Abacuses are fast and accurate. On the abacus, the beads on the wires stand for ones, tens, hundreds and thousands, starting from the bottom wire. （珠子）（代表 stand for ）（底部的橫桿） The abacus in the picture shows a number. Write it down in figures and then in words. Multiply it by zero and then add 1. What is the answer? （用數(shù)字）（用文字） Numbers: everyone’s language Modern electronic calculators can add, subtract, multiply and divide. It can also calculate percentages and square roots. （平方根） Numbers: everyone’s language Computers are very powerful calculating machines. A puter can do a calculation in a flash, but you might not be able to do it in your whole lifetime. （強(qiáng)大的）（做計(jì)算）（一瞬間）（能夠做）（一輩子） May is asking T M Li, the writer, some questions about his article on numbers. His answers are not always clear. Read the article and make Li’s answers clearer. Write one word in each blank. 1 Every one knows it. Knows what? The Language of numbers. 2 Long ago, people wrote them in many different ways. Wrote what? Numbers. 3. People all count in this way. In what way? In tens. 4. The Indians first invented that system of numbers. Which system of numbers? 1 to 9. 5. The invention helped people write in big numbers. What invention? Zero. 6. They are fast and accurate. What? Abacuses. 7Computers are very powerful ones. Very powerful what? Calculating machines. Give answers to these questions about the article. 1 How did people in ancient times count in the same way? They nearly all __________________. 2 What do the beads on the wires of an abacus stand for? The beads stand for ________________________________________ starting from the bottom wire. 3 What can a modern electronic calculator do? It can ______________________________________. counted in tens ones, tens, hundreds and thousands add, subtract, multiply and divide. Give answers to these questions about the article. 4 What else can a modern electronic calculator do ? I can also __________________________________________. 5 How quickly can a puter do a calculation? I can do a calculation _____________________. calculate percentages and square roots in a flash 1 以不同的方式 2 數(shù)字體系 3 由 … 組成 4 電子計(jì)算器 5 平方根 6 一瞬間 7 以十為單位計(jì)算８代表 9 做運(yùn)算 10 在古代 1 in different ways 2 the system of numbers 3 consist of= be made up of 4 electronic calculators 5 square roots 6 in a flash 7 count in tens 8 stand for 9 do a calculation 10 in ancient times Synopsis by

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