Unit4Period2課時(shí)課件牛津上海版英語(yǔ)八年級(jí)上冊(cè)

Watchthevideoclip.3-3Saythefollowingdecimals.123twenty-sixpointtwothreeforty-eightpointfoureightfivehundredandtwenty-sixpointfourthreetwoonepointofoursixeightFractions4-1123Herearetwofractions.Howcanwereadthem?UsecardinalnumbersUseordinalnumbersonethird44-2Notethesespecialfractions:123a/onehalfa/onequarter44-3123Howtosayamixedfraction?44-41234Saythefollowingfractions.one-eighthfourteentwenty-secondstwenty-twoandeleven-nineteenthsExercisesInpairs,practisesayingthefollowingnumbers.0.719.211/553.358?7/90.1686?zeropointsevennineteenpointtwooneone-fifthfifty-threepointthreefiveConsolidationWorkbook8A,page33.Answer

the

questions.3.Whatdoesanelectroniccalculatorallowustodo?TheIndians.1.Whoinventedanddevelopedthenumberzero?2.

Whatisthemostbasicnon-electroniccalculator?Anabacus.4.Whatistheadvantageofacomputer?Itcansolvedifficultproblemsinaflash.Itallowsustoadd,subtract,multiply,divide,findpercentagesandsquareroots.doallkindsofcalculations.Thinkandanswerthequestions.Whattypeoftextisthis?Itis

aninformationaltext/exposition(說(shuō)明文).Whatisthemainpurposeofthetext?Wherecanyouprobablyfindthisarticle?a) Toinform（告知）b) Toentertain（娛樂(lè)）c) Topersuade（勸說(shuō)）a)Inahistorytextbookb)inanovel(小說(shuō))√作者的寫(xiě)作目的√10Whathelpsyoudivideitinto4parts?Subheadings(小標(biāo)題).Subheadingsplayanimportantroleinholdingthereaders’attention.Whatmakesgoodsubheadings?directandtothepoint緊扣主題interestingconsistent保持一致性a)lengthb)structureshortandclearReadthesubheadingsofthetext.AncientnumbersZeroCalculatingmachinesBrainagainstcomputerAretheyshortandclear?√Aretheyofsimilarlength?√Aretheyconsistent(一致的)instructure?√AtopicsentenceAtopicsentenceisthemostimportantsentenceinaparagraph.Itsummarizes(總結(jié))theinformationintheparagraph.Inmostcases,atopicsentenceappearsatornearthebeginningortheendofaparagraph.主題句/中心句Read“Ancientnumbers”.Underlinethetopicsentence.factsandreasons15Read“Calculatingmachines”.Findthetopicsentence.

Canyouwriteatopicsentence?Calculatingmachinesareourgoodhelperstododifficultcalculations.examplesanddescriptionsRead“Brainagainstcomputer”.Underlinethetopicsentence.Howdoesthewriteranswerthisquestion?Bygivingexamplesandmakingcomparisonandcontrast(作比較).Thinkandanswerthequestion.1.Supposethecompetitiontookplaceatpresent,woulditbepossibleforamathsgeniuslikeShakuntalatobeatacomputer?Atthattime,itwaspossibleforamathsgeniustobeatacomputer.Today,itwouldprobablybeimpossibleastechnologyhascomeaverylongway.Acomputerrunsmuchfasterthanahumanbrain.2.Doyouthinkcomputerswillbesmarterthanhumansinthefuture?Whyorwhynot?Idon’tthinkcomputerswillbesmarterthanhumansinthefuture.Becauseourbrainscanunderstandthemeaningofthingsbetterandcreatenewideas.Computershavetobeprogrammedwithinstructionsbyhumans.Theythemselvescannotcreatenewideas.SupportingdetailsSubheadingsTopicsentencesSubheadingsdividethetextintosectionsandtellthetopicofeachsection.shortclearconcise簡(jiǎn)練

Topicsentencesexpresswhattheparagraphisabout.topiccentralpointSupportingdetailsincludefacts,examples,anecdotes,reasonsordescriptivedetails.DecimalsHerea