chapter 4revision

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1、Chapter4Revision1.加plus2.减minus3.乘multiply/times4.除/除以divide5.度degree6.百分数percentage7.发明invent(n.invention)8.特别especially9.大脑brain10.然而however11.差不多nearly12.数数count13.印度人Indian14.发展develop15.精确的accurate16.珠子bead17.丝/线wire18.底部的bottom19.电子的electronic20.强大的powerful21

2、.找零change22.双的double23.同伴fellow24.事故traffic25.上升rise26.决定decision(v.decide)27.核对check28.指导/指示instruction29.总的total30.分别地separatelyII.Phrases至少atleast2.由…组成consistof3.代表standfor4.一瞬间inaflash5.在古代inancienttimes6.用许多不同的方法inmanydifferentways7.从…到from…to8.写下；记下writedown

3、9.数字系统thesystemofnumbers10.国际语言internationallanguage11.以十计算countintens12.用数字写下writedowninfigures13.帮助某人做某事helpsb(to)dosth14.决定做某事decidetodosth./makeupone’smindtodosth./makeadecisiontodosth.15.很久以前long,longagoIII.Fillintheblanks1.Therewillbean__________(nation)meeti

4、nginBeijingnextmonth.2.64%isa______________.(percent)3.Theseacovers______________(near)three-fourthsoftheworld'ssurface.4.Couldyoutellmeyour______________(fly)numbersothatIcanpickyouupattheairport?internationalpercentagenearlyflight5.Tigersarevery_________(power)an

5、imals.6.Thezerois_________(especial)animportantnumber.7.Thereare_________(million)ofbooksinShenzhenLibrary.8.Water______________(由…组成)oxygenandhydrogen.9.Abacusesaregood_________________(计算器)10.Greatprogress__________________(开始于)hardworkeveryday.11.Many___________

6、inancientChina___________alotofimportant____________(invent).powerfulespeciallymillionsconsistsofcalculatingmachinesstartsfrom/beginsfrominventorsinventedinventions12.Chinaisa_________country,whileAmericaisa__________one.(develop)13.Abacusisa__________machinetodo__

7、______,thatis,abacusisakindof___________.(calculate)14.__________5by9is45.(multiply)5________9is45.(time)15.27___________by3is9.(divide)__________27by3,andyouhave9.16.12______4is16._____12and4,andyouget16.17.__________________15from20,andyouhave5.(subtract)20______

8、___________15is5.(minus)developingdevelopedcalculatingcalculationcalculatorMultiplytimesdividedDivideplusAddSubtractminusIIIParaphrase(10’)1.Thes