深圳牛津英語七年級chapterPPT演示課件

1、12a what do you know about?1 a decimal numbers2 a pair of odd numbers 3 a fraction4 zero5 add;plus6 subtract;minus7 mutiply; times 8 divide9 a number showing degrees10 a percentage11 a pair of even numbers12 equalsa +b 0c 5/8d e =f 13 45g 8 210h 90i j 0.82 k 45%l 345calculating machine6calculating m

2、achinebeadswires 7calculating machineaddsubtractmultiply divide percentagesquare root8calculating machineaddsubtractmultiplydividepercentagessquare roots9calculating machine10calculating machinea computer11calculating machinea computer12131415why do people still use abacuses today?16what can an elec

3、tronic calculator do?17how fast can shakuntala devi calculate?18how long can a computer do a calculation?19how long did the computer take to solve the difficult problem?20what should people do to make computers calculate? program them with instructions21what do the beads on the wires represent? ones

4、, tens, hundreds, thousands and so on.22numbers: everyones language（他或她自己（他或她自己的語言）的語言）23 ancient numbers in ancient times, people wrote numbers in many different ways. however, they nearly all counted in tens.different ways of writing the number 6（在古代）（在古代）（以很多（以很多不同的方式）不同的方式）（以十為單位）（以十為單位）24 zero

5、the system of numbers today consists of the numbers from 1 to 9 and 0(zero). the indians first invented and developed the 1 to 9 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

6、 to write the biggest number. what is it?（數(shù)字體系）（數(shù)字體系）（invent. v. invention n. inventor n.）25c1 find these words in the article on page 45. read the words around them and choose the best meanings.26 c2 find the words in column a in the article and match them with the meanings in column b.27c3 what do

7、 the following descriptions refer to? write down the correct names in the blanks. calculatorcomputerabacus28 1 every one knows it. knows what? the language of numbers.293031language points321. at least 至少= not less than we should recite at least 10 english words every day.反義詞: at most 至多the concert

8、hall can hold at most 1,000 people.332. in ancient times 在古代= long long ago= once upon a timein ancient times, people used stones as money.ancient 反義詞: modern 現(xiàn)代的times = age n. 時代 343. consist of 由組成= include = be made up of our class consists of 25 girls and 30 boys.4. invent = make sth. for the fi

9、rst time v. 發(fā)明; 創(chuàng)造the ancient chinese invented the compass.invention n. 發(fā)明 inventor 發(fā)明家355.develop = grow better or bigger v. 發(fā)展; 發(fā)育 development n. 發(fā)展the indians first invented and developed the 1 to 9 system of numbers.developing adj. 發(fā)展中的developed adj. 發(fā)達的india is a developing country. the usa is

10、a developed country.366. help sb (to ) do sth. = help sb. with sth.i like helping my mother do the housework.= i like helping my mother with the housework.7. stand for = represent 代表; 表示prc stands for peoples republic of china. 378. in a flash = very quickly = in a very short time 一瞬間;很快a computer c

11、an do a calculation in a flash.電腦可以在一瞬間完成計算.9. why not do sth.? = why dont you do sth.?38why not see a film tonight? = why dont you see a film tonight?10.buy sb.sth.= buy sth. for sb.my mother bought me a new bike last month.=my mother bought a new bike for me last month.3940i .imperative sentences

12、祈使句祈使句 1 祈使句祈使句:表示請求表示請求,命令命令,勸告勸告,祝愿或建議的句子祝愿或建議的句子. e.g. close the window, please. e.g. be quiet.2 使用祈使句應注意的幾點使用祈使句應注意的幾點.a: 肯定祈使句的謂語總是用動詞原形肯定祈使句的謂語總是用動詞原形. be careful.小心小心 have a good time.愿你玩得開心愿你玩得開心.41b: 否定祈使句否定祈使句. 祈使句否定式的構(gòu)成方法是祈使句否定式的構(gòu)成方法是在動詞原形前加在動詞原形前加dontdont laugh.不要笑不要笑.dont be late again.

13、不要再遲到了不要再遲到了.c:與與please連用連用.可用于句首或句末可用于句首或句末.sit down, please. 請坐請坐.please dont get angry. 請不要生氣請不要生氣.42d:以以let開頭的祈使句開頭的祈使句.let me help you. 讓我?guī)椭阕屛規(guī)椭?lets go to the cinema. 我們一起去電影院我們一起去電影院. 這類祈使句的否定式的形式如下這類祈使句的否定式的形式如下:lets not hurry.let后的動詞要用原形后的動詞要用原形.43ii. 加減乘除表示法加減乘除表示法1. “加加”用用plus，and或或add表

14、示；表示； “等于等于”用用is, equal等詞表示。等詞表示。2+3=? 可表示為：可表示為： how much is two plus three?2+3=5 two plus three is five two and three is equal to five two and three is five two added to three is five 44加減乘除表示法加減乘除表示法2. “減減”用用 minus或或 subtract表示表示106? how much is ten minus six?10-6=4 ten minus six is four subtract

15、 six from ten ,and we get four. 453.“乘乘”用用times或或multiply表示表示3x4? how much is three times four?3x4=12 three times four is twelvemultiply three by four，we get twelve three multiplied by four is twelve 464. “除除”用用divide的過去分詞形式表示的過去分詞形式表示164=? how much is sixteen divided by four?1644 sixteen divided by

16、 four is four divide sixteen by four , and we get four. 47 有關(guān)數(shù)字的命令和陳述add 3 and (to) 9subtract 3 from 9 multiply 3 by 9 divide 9 by 3 3+9 9-3 39 93 4849ddandubtractfromultiplybyivideby2lus105inus43imes76ivided250 iii. 基數(shù)詞和序數(shù)詞51基數(shù)詞表示確切整數(shù)時，hundred /thousand后不加s e.g. 200 two hundred 當基數(shù)詞表示不確定數(shù)字，如當基數(shù)詞表示不

17、確定數(shù)字，如 數(shù)十個的成百的，數(shù)十個的成百的，成千上萬基數(shù)詞以復數(shù)形式出現(xiàn)成千上萬基數(shù)詞以復數(shù)形式出現(xiàn)如：如： tens of 數(shù)十個的數(shù)十個的 hundreds of 數(shù)百個的數(shù)百個的 數(shù)千個的數(shù)千個的數(shù)百萬個的數(shù)百萬個的thousands ofmillions of 52序數(shù)詞：表示人或事物的順序序數(shù)詞：表示人或事物的順序 first/second/third 序數(shù)詞變化規(guī)律序數(shù)詞變化規(guī)律 序數(shù)詞是在基數(shù)詞的基礎(chǔ)上變化而成的序數(shù)詞是在基數(shù)詞的基礎(chǔ)上變化而成的多數(shù)序數(shù)詞在基數(shù)詞的基礎(chǔ)上加多數(shù)序數(shù)詞在基數(shù)詞的基礎(chǔ)上加 t h four fourth seven seventh第第1,第第2,第

18、第3要注意要注意one first two second three third 8要減要減t , 9要減要減e再加再加the.g. eight eighth nine ninth基數(shù)詞以基數(shù)詞以 ve結(jié)尾，變結(jié)尾，變 ve 為為f再加再加 th thirty thirtieth five fifth53iv.小數(shù)表示法讀法讀法小數(shù)點的左邊按基數(shù)詞讀（當小數(shù)點左邊為零時，零可省略不讀），小數(shù)點讀point，小數(shù)點右側(cè)各數(shù)位單獨朗讀0.5 zero point five ( point five)72.78 1.345 seventy-two point seven eightone point

19、 three four five 當小數(shù)數(shù)值大于1時 ，小數(shù)后的名詞用復數(shù)；當小數(shù)數(shù)字小于1時，小數(shù)后面的名詞用單數(shù) 1.5噸 one point five tons 0.49噸 zero point four nine ton 5455now try a quiz about numbers. listen to the instructions on the recording, and circle the right answer. 80 80 49 49 1717 2.66 2.66 26% 26% 2/62/6 $75 $75 75% 75% 7575o o1/8 1/8 0.75

20、 0.75 3333 56 56 65 65 66669090o o 90% 90% 1/9 1/97 2565 3881 7 2565 3881 2566 28812566 2881 2565 2881 2565 28818 1.8% 8 1.8% 80%80% 18% 18%9 $ 5,000 9 $ 5,000 $ 50, 000$ 50, 000 $ 50,000,000 $ 50,000,00010 30.510 30.5o o 13.513.5o o 35 35o o 561 which one of these is an even number?2 which one of t

21、hese 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?576 which one of these is a number showing degrees?7 my phone number is 2565 2881.8 18 per cent of my classmates come to school on foot.9 this ring costs fifty thous

22、and dollars.10 the highest temperature today was 30 point 5 degrees.585960616263 以以說事說事為主的文章屬于說明文，為主的文章屬于說明文，說明文主說明文主要包括要包括地點介紹地點介紹、人物介紹人物介紹、知識簡介知識簡介、圖片圖片說明說明、圖表說明圖表說明、旅游安排旅游安排等。等。說明文主要以說明文主要以描述描述為表達方式，來說明某個事為表達方式，來說明某個事物的物的類別類別、性質(zhì)性質(zhì)、特征特征、狀態(tài)狀態(tài)或或形成的原因形成的原因、發(fā)生發(fā)展的過程發(fā)生發(fā)展的過程等等。等等。 寫說明文應注重客觀事實，寫說明文應注重客觀事實，用事實說話用事實說話，抓住事物的抓住事物的特征特征，把地點、事物和事理，把地點、事物和事理解釋清解釋清楚楚，語言簡明扼要語言簡明扼要。64traffic accidents may asked officer chen about traffic accidents. then she drew a