8au4

1、8AU4一、單詞1、dividev.除以divideby除以divide…into…分成subtract=minusv.減去eg:subtract3from9=9minus39減3multiplyv.乘以eg:multiply3by93乘以9add=plusv.加additionn.另外2、degreen.度數(shù)percentagen.百分率fractionn.分?jǐn)?shù)squareroot平方根3、calculatev.計(jì)算calculati

2、onn.計(jì)算calculatn.計(jì)算器4、inventv.發(fā)明inventionn.發(fā)明inventn.發(fā)明家eg:Edisonwasagreatinventwhohadinventedmanythings.Alloftheinventionsareveryusefulnowadays.愛迪生是一個(gè)發(fā)明了很多東西的偉大發(fā)明家。如今，所有的發(fā)明都很有用。5、developv.發(fā)展，壯大developinga.發(fā)展中的eg:Chinaisa

3、developingcountry.中國(guó)是一個(gè)發(fā)展中國(guó)家。developeda.發(fā)達(dá)的eg:Americaisadevelopedcountry.美國(guó)是個(gè)發(fā)達(dá)國(guó)家。develpomentn.發(fā)展withthedevelopmentof隨著…的發(fā)展eg:Itdevelopsalongwiththedevelopmentofpractice.它隨著實(shí)踐的發(fā)展而發(fā)展。6、accuratea.正確無誤的accuratelyad.正確無誤地7、e

4、lectrica.電的導(dǎo)電的發(fā)電的electricala.與電有關(guān)的電氣科學(xué)的electricityn.電electronn.電子electronica.電子的eg:electrickettles電熱壺electricalappliances電器用品electronicequipment電子設(shè)備8、inaflash=atveryshttime轉(zhuǎn)瞬間，立即（提問用Howsoon）9、solvev.解決=wkoutsolutionn.解決e

5、g:Itmaytakealongtimetofindasolutiontotheproblem.也許要花很長(zhǎng)時(shí)間才能找到解決這個(gè)問題的辦法。10、lightningn.閃電thurdern.雷likelightning閃電般的，飛快的11、checkv.檢查，核查=examinecheckin辦理登記手續(xù)checkout結(jié)帳離開二、詞組1.adecimalnumber2.apairofoddnumbers3.apairofevennum

6、bers4.differentwaysofwritingnumbers5.atleast6.inancienttimes7.inmantdifferebtways8.inyourwholelifetime9.thesystemofnumbers10.averyimptantinvention11.oneofthefirstcalculatingmachines12.programthecomputer6show.3、Thiswasave

7、ryimptantinventionbecauseitmadeiteasiertowritebignumberstocalculate.4、Abacusesaresofastaccuratethatpeoplestillusethemyoday.5、A:HowmanytrafficaccidentswerethereintheyeartwothousinourcityB:Threethoussixhundredniyone.A:What