Unit5Developingideas(1)课件外研版英语八年级下册

LookingintonatureUnit5英语外研版八年级下册Developingideas(1)通过本课时的学习，学生能够：1.听懂关于亚马逊雨林“沸腾河”的听力材料，提取关键信息；2.掌握单词重音规则，准确朗读多音节词；3.运用“maybe”“perhaps”“It’slikely...”等表达谈论可能性；4.了解自然未解之谜，保持对自然的好奇心。重点

Learningobjectives重点重点Natureisfullofsecrets.Theyarewaitingtobeexplained.Theseincludeblackholes,thebeginningoftheuniverse,theLochNessMonsterandBigfoot.Thesesecretsawakenourcuriosityanddrivescientiststobetterunderstandthewondersaroundus.Read,matchandsayReadthetextaboutnature.Read,matchandsaytheblackhole黑洞theBigfoot大脚野人theLochNessMonster尼斯湖水怪thebeginningoftheuniverse宇宙起源Whichofthesecretsinterestsyoumost?Theblackholeinterestsmemost.Ithinkit'sverymysterious.Iwanttoknowwhatisinsideablackhole.Itdrivesscientiststoexplorespaceandawakensmycuriosity.Matchthepictureswiththesecrets.LookandsayDoyoubelievethatthewatertemperatureofarivercanreach90°C?Let’sexplore!Listentothetalkandchoosethecorrecttopic.aAdisappearingriverinSouthAmerica.bThelifeofthepeopleintheAmazonrainforest.cAboilingriverintheAmazonrainforest.ListenandchooseWhatisit?Itisaboilingriverashotas

1________℃.Whatdothelocalpeopledowithit?·They

2________withit.·Theycleanwithit.·Theymake

3________withit.·Theysometimesgoswimminginit,butonlyafter⁴______.What'sthespeaker'sopinion?It'soneofthemost⁵________oftherainforest.Whatinformationshouldyoulistenfor?factsabouttheriverpeople’sactivitiesthespeaker’sopinionReadandthinkListentothetalkagainandcompletetheprofile.Whatisit?Itisaboilingriverashotas

1________℃.Whatdothelocalpeopledowithit?·They

2________withit.·Theycleanwithit.·Theymake

3________withit.·Theysometimesgoswimminginit,butonlyafter⁴___________.What'sthespeaker'sopinion?It'soneofthemost⁵________________oftherainforest.86cookteaheavyrainamazingwondersListenandfillListeningforopinions

ExpressionssuchasIthink,IbelieveandIguessshowpeople'sopinions.Remember:peoplearesharingtheirideas,soyoudon'thavetoagree.Butyoushouldlistentotheotherperson'sopinionsandbepolite.What’sthespeaker’sopinion?ReadandunderlinePhoneticsinuseStressinwords(1)Awordcanbestressedondifferentsyllables.Ifwestressthesecondsyllable,thewordisusuallyaverb.Forexample,presentdescribesthetime,whilepresentdescribesanaction.Listenandpayattentiontothestress.recordaworldrecord

/recordthetemperatureproducefreshproduce/produceoxygenperfectaperfectgift/perfectherskillsdesertthebiggestdesertonearth/deserthisdutyLearnandlistenListenagainandreadthewordsaloud,thenmarkthestressofeachword.recordaworldrecord/recordthetemperatureproducefreshproduce/produceoxygenperfectaperfectgift/perfectherskillsdesertthebiggestdesertonearth/deserthisduty/ˈrekɔːd//rɪˈkɔːd/​​/ˈprɒdjuːs//prəˈdjuːs/​​/ˈpɜːfɪkt//pəˈfekt/​​/ˈdezət//dɪˈzɜːt/ListenandmarkˈˈˈˈˈˈˈˈReadthetableandguesswhattheconversationmaybeabout.ReadandguessThetouristsandtheguidearehavingaheateddiscussion.Let’slistencarefully.Listentotheconversationandcompletethetable.sunshineheattheriverbecomeshot700kilometres/700kminthewaterproducepossibleresearchListenandfillWhydothetouristsandguidehavedifferentideasabouttheboilingriver?Howdoesscientificevidencechangeourunderstandingofnaturalmysteries?Whoseopiniondoyouagreewith?Why?Thetouristsonlyguessthereasons,buttheguidehasmorefactsandknowledge.Theguideknowsthetruthfromresearch.ThinkandanswerScientificevidencehelpsusstopguessing.Ithelpsusfindtherealreasonsfornaturalmysteries.Iagreewiththeguide.Becausehehasscientificevidence,likethedistanceofthevolcano.Guide:Ancientpeopleherethoughtthatthesunmakestheriverhot.Boy:It'spossible,right?There'salotofsunshinehere.Guide:Actually,it'sunlikelyforthesuntoheattheriverthatmuch.Justthinkofoutdoorswimmingpools.Wouldthewatergetto86°Cinsummer?Girl:You'reright.Buthowaboutvolcanoes?Perhapstheriverpassesavolcanoandbecomeshot?Guide:Goodguess!ButI'mafraidthat'snotthereason.Thenearestvolcanoisabout700kilometresaway.Girl:Ihaveanotheridea!Maybetherearesomechemicalsinthewater.Theycanproduceheat.I'vestudiedthematschool.Guide:That'spossible.Butscientistshaven'tfoundsuchchemicalsintheriveryet.Theyneedtodomoreresearch...Listenagain.Thentalkabouthowthespeakersdiscusspossibilities.ListenandsayLearningtolearnTalkingaboutpossibilitiesCould,mayandmightareusedtotalkaboutpossibilities.Wordssuchasmaybeandperhapsareused,too.WecanalsousethestructureIt'scertain/likely/possiblethat...ReadandlearnListenandread.Thenactitoutingroups.ListenandactoutGuide:Ancientpeopleherethoughtthatthesunmakestheriverhot.Boy:It'spossible,right?There'salotofsunshinehere.Guide:Actually,it'sunlikelyforthesuntoheattheriverthatmuch.Justthinkofoutdoorswimmingpools.Wouldthewatergetto86°Cinsummer?Girl:You'reright.Buthowaboutvolcanoes?Perhapstheriverpassesavolcanoandbecomeshot?Guide:Goodguess!ButI'mafraidthat'snotthereason.Thenearestvolcanoisabout700kilometresaway.Girl:Ihaveanotheridea!Maybetherearesomechemicalsinthewater.Theycanproduceheat.I'vestudiedthematschool.Guide:That'spossible.Butscientistshaven'tfoundsuchchemicalsintheriveryet.Theyneedtodomoreresearch...Whatunsolvedsecretsofnaturedothesepicturesshow?CropcirclesAtlantisLookandsay麦田怪圈，它是田野里出现的巨大圆形图案。亚特兰蒂斯，大西岛(一座美丽富饶的海岛，据说已沉入海底消失)Yes,it’sverystrange.I’mcuriousaboutthepossiblereasons.Haveyouheardof...?Perhapsit’sbecause...Chooseoneunsolvedsecretofnatureandtalkaboutpossibleexplanations.→Usefulexpressions·Thetruthmaybe...·It'slikelythat...·Perhapsit'sbecause...·It'sprobablyaresultof...·There'sa(strong)possibilitythat...·It'spossiblethat...·There'sachancethat...ChooseandtalkYes,it’sverystrange.I’mcuriousaboutthepossiblereasons.Haveyouheardofcropcircles?Perhapsit’sbecausesomepeoplemakethemasakindofart.It'slikelythatsomearemadebyhumans,butothersaresobigandperfect.There'sapossibilitythattheyarecausedbyunusualweather,likestrongwinds.Thetruthmaybeamixofbothhumanworkandnaturalforces.ChooseandtalkChooseoneunsolvedsecretofnatureandtalkaboutpossibleexplanations.1.Ifyoufindanewnaturalmystery,likeastrangehotspringoraspecialrock,howwillyoustudyit?Iwillfirstobserveitcarefullyandtakephotosornotes.ThenIwillasklocalpeopleaboutitsstories.Finally,I