Unit4Period1課時課件牛津上海版英語八年級上冊

language/'l??ɡw??/語言Numbers:Everyone’slanguageHowdoyouunderstandthistitle?Howmanylanguagesdoyouknow?Everyoneknowsatleasttwo—hisorherownlanguageandtheinternationallanguageofnumbers.Readthewholetextandanswerthequestions.Howmanypartsarethereinthetext?Whatarethey?Four.Ancientnumbers,zero,calculatingmachinesandbrainagainstcomputer.Read‘Ancientnumbers’anddescribethepicture.Inancienttimes,peoplewrotenumbersinmanydifferentways.They

nearlyallcountedinthesameway–intens.6Arabicnumerals阿拉伯?dāng)?shù)字ancientpeopleintens十進(jìn)制/‘n??l?/幾乎Read‘Zero’andanswerthequestions.Whatisthesystemofnumbersmostpeopleusetoday?Whofirstinventedanddevelopedthissystem?Whyis‘zero’animportantinvention?Thesystemofnumberswithnumbersfrom1to9and0./‘s?st?m/系統(tǒng)TheIndiansfirstinventedanddevelopedthissystem./‘?nvent/發(fā)明/d?‘vel?p/創(chuàng)造/?n‘ven?n/n.發(fā)明Becauseitmadeiteasiertowritebignumbersandtocalculate./'k?lkjule?t/計(jì)算ZeroWhatisthisparagraphmainlyabout?Theinventorandtheimportanceofzero.CalculatingmachinesFeatures(特點(diǎn))AbacusesAbacusesaresofastandaccurate

thatpeoplestillusethemtoday./‘?b?k?s/算盤/'?kj?r?t/精確的so…that如此…以至于fast,accurateElectroniccalculatorCalculatingmachinesFeatures(特點(diǎn))Abacuses/‘?b?k?s/算盤fast,accurateElectroniccalculator/??lek'tr?n?k/電子的/'k?lkjule?t?(r)/計(jì)算器Itcanadd,subtract,multiplyanddivide.Itcanalsocalculatepercentagesandsquareroots.domanykindsofcalculations/‘k?lkj?’le??n/n.計(jì)算/s?b'tr?kt/減/'m?lt?pla?/乘/d?'va?d/除/p?'sent??/百分率CalculatingmachinesFeatures(特點(diǎn))Abacuses/‘?b?k?s/算盤fast,accurateElectroniccalculator/??lek'tr?n?k/電子的/'k?lkjule?t?(r)/計(jì)算器domanykindsofcalculations/‘k?lkj?’le??n/n.計(jì)算computersInaflash,acomputercandoacalculationthatyoucouldnotdoinyourwhole

lifetime./h??l/整個/'la?fta?m/一生powerful/‘pa??fl/強(qiáng)有力的Brainagainstcomputer/bre?n/大腦/?'ɡenst/與…相比Findthenumberthat,whenitismultiplied23timesbyitself,givesthisanswer:916748676920039158098660927585380162483106680144308622407126516427934657040867096593279205767480806790022783016354924852380335745316935111903596577547340075681688305620821016129132845546805780158806771哪個數(shù)的23次方是以下這個數(shù)字？ShakuntalaDeviSomepeoplecallthebrainalivingcomputer.Isahumanbrainamorepowerfulcalculatorthanacomputer?Thefollowingstorymaygiveananswer./‘hju:m?n/人類Read‘Brainagainstcomputer’WhydowesayShakuntalahasanamazingbrain?/?‘me?z??/令人驚奇的Shejusttookfiftysecondstofindtheanswer,likelightning.Findthenumberthat,whenitismultiplied23timesbyitself,givesthisanswer:916748676920039158098660927585380162483106680144308622407126516427934657040867096593279205767480806790022783016354924852380335745316935111903596577547340075681688305620821016129132845546805780158806771/'la?tn??/閃電飛快地Thecomputertookaminute.Someonehadtofirstprogramthecomputerwithinstructions./'pr??ɡr?m/編寫程序Ittookmanyhours.callthebrainalivingcomputerNoonehadtoprogramShakuntala./‘l?v??/活的3-21230AncientnumbersZeroCalculatingmachinesBrainagainstcomputerAncientnumberszerocalculatingmachinesbrainagainstcomputer16-512345678910111213141516A4Writethewordsthatgowiththedescriptions.1Anancientcalculatingmachinethatisstillusetoday.2Alivingcomputer.3Asmallmachinethatuseselectronicpowertodocalculations.4Averypowerfulmachinefordoingcalculations.An____________.The____________.A____________.A____________.abacusbraincalculatorcomputer16-812345678910111213141516ZeroMostofususethesystemofnumberswithnumbersfrom1to9and0(zero).Withthesetennumbers,weFindthenumberthat,whenitismultiplied23timesbyitself,givesthisanswer:91674867692003915809866092758538016248310668014430862240712651642793465704086709659327920576748080679002278301635492485238033574531693511190359657754734007568168830562082101612913284554680578015880677116-1012345678910111213141516BrainagainstcomputerSomepeoplecallthebrainalivingcomputer.

Isahumanbrainamorepowerfulcalculatorthana16-1112345678910111213141516Shakuntala’sbraintookfiftysecondstofindtheanswer,likelightning.Thecomputertookaminute.However,someonehadtofirstprogramtheAnswer:546,372,891.Passage16-1212345678910111213141516CMayisaskingMrLi,thewriter,somequestions18-13123456789101112131415161MrLi:May:MrLi:Everyoneknowsit.Knowswhat?The___________of___________.2MrLi:May:MrLi:Longago,peoplewrotetheminmanydifferentways.Wrotewhat?___________.34languagenumbersNumbersIntensZero5MrLi:May:MrLi:They’resofastandaccuratethatpeoplestillusethemtoday.Stillusewhat?___________.AbacusesCalculatingmachineshumanbraincomputer16-1412345678910111213141516DCompleteanswerstothesequestionsabout

MrLi’sarticle.Workaloneorinpairs.16-1512345678910111213141516Canyouexplainwhywecountintens?

Wecountintensbecausewehave__________fingers.?

Theyinventedthe________________________