牛津深圳版英語七上74《the world of numbers》之四(文件)
【正文】 ve 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 電子計算器 5 平方根 6 一瞬間 7 以十為單位計算 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 paragraph: P1: Ancient numbers– In ancient times, numbers were written in different ways, but counting was nearly always in tens. Synopsis by paragraph: P2: Zero Everyone uses the number system 1 to 9 plus 0. The system was invented by the Indians. Zero makes it easier to write big numbers and to calculate. Synopsis by paragraph: P35: Calculating machines – Descriptions of three calculating machines: the ancient abacus,the modern electronic calculator and the puter. Now try a quiz about numbers. Listen to the instructions on the recording, and circle the right answer. 1 80 49 17 2 26% 2/6 3 $75 75% 75o 4 1/8 33 5 56 65 66 6 90o 90% 1/9 7 2565 3881 2566 2881 2565 2881 8 % 80% 18% 9 $ 5,000 $ 50, 000 $ 50,000,000 10 35o 1 Which one of these is an even number? 2 Which one of these is a fraction? 3 Which one of these is a percentage? 4 Which one of these is a decimal number? 5 Which one of these is an odd number? 6 Which one of these is a number showing degrees? 7 My phone number is 2565 2881. 8 18 per cent of my classmates e to school on foot. 9 This ring costs fifty thousand dollars. 10 The highest temperature today was 30 point 5 degrees. A Imperative sentences When we give orders or instructions to people, we tell them to do or not to do something. We usually start the sentences with a verb. We often make instructions more polite by starting with please. Sometimes we start with the name of the person receiving the instruction. Read the instructions below Be quiet. Please have a seat. David, pay attention. Don’t be afraid. Please do not make a noise. Alan, don’t be late. Read the di
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號-1