Unit+5+A+Delicate+World+Using+language+高中英语外研版（2019）选择性必修二

Itasanemptyobject高中新外研版选择性必修二LearningobjectivesTolearntheusageofit

asanemptyobject.

Tolearntodescribethechangesbyusingitasanemptyobject.ComparethesentencesaNovisitorwouldthinkitsurprisingthattheislandisaUNESCOWorldHeritageSite.bNovisitorwouldthinkthattheislandbeingaUNESCOWorldHeritageSiteissurprising.cExpertsfeltitnecessarytocomeupwithaplantoremovealltherabbitsfromtheisland.dExpertsfelttocomeupwithaplantoremovealltherabbitsfromtheislandwasnecessary.1Whatdoes“it”refertoinsentences(a)and(c)?2Whatisthedifferencebetweenthesentencesineachgroup?aNovisitorwouldthinkitsurprisingthattheislandisaUNESCOWorldHeritageSite.cExpertsfeltitnecessarytocomeupwithaplantoremovealltherabbitsfromtheisland.1Whatdoes“it”refertoinsentences(a)and(c)?ComparethesentencesItreferstothatclauseinsentence(a)andan

infinitiveinsentence(c).2Whatisthedifferencebetweenthesentencesineachgroup?

ComparethesentencesWhentheobjectofasentenceisathat-clause(b)oraninfinitive(d),wesometimesuse“it”asanemptyobjectandputtherealobjectlatertokeepbalance.Forexample,sentence(a)uses“it”astheemptyobjectof“think”,referringtotherealobject:“theislandisaUNESCOWorldHeritageSite”.Sentence(b)usesthat-clauseastheobjectof“think”.aNovisitorwouldthinkitsurprisingthattheislandisaUNESCOWorldHeritageSite.bNovisitorwouldthinkthattheislandbeingaUNESCOWorldHeritageSiteissurprising.cExpertsfeltitnecessarytocomeupwithaplantoremovealltherabbitsfromtheisland.dExpertsfelttocomeupwithaplantoremovealltherabbitsfromtheislandwasnecessary.LookformoresentencesThisincidentmadeitclearthattherat,mouseandrabbitproblemneededsolvingonceandforall.

…butwehumansoweittotheislandtogiveitahappyending.Summariseitsuse动词＋it＋形容词/名词＋(for/ofsb)＋todo/that...it作形式宾语it作形式宾语1.动词＋it＋形容词/名词＋(for/ofsb)＋todo/that...Wemake

itaruletovisit

theoldeveryweekend.我们规定每个周末都去看望那些老人们。Idon’tfeel

itdifficultforme

totackle

theproblem.我觉得解决这个问题并不难。Theyconsidered

itvitalthattheyshouldkeeptheirnaturalhabitat.他们认为保持它们的自然栖息地很重要。Itasanemptyobjectit作形式宾语2.动词＋it＋nogood/nouse/useless/awasteoftime/worthwhile＋doing...I’llmake

itworthwhile

tellingmeabouthissecret.告诉我他的秘密，我会酬谢你的。Hethought

itnousetryingtomultiplytheirnumber.他认为企图增加它们的数量没有用。it作形式宾语3.动词appreciate/hate/love/like/dislike后面接if或when引导的从句作宾语时，中间需用形式宾语it，构成“appreciate/hate/love/like/dislike＋it＋if/when从句”。Hewillappreciateit

iftheyassisthimtotacklethedifficultproblem.如果他们帮他解决这个难题，他将非常感激。Shehated

it

whenhebraggedthathewasthemostinfluentialmaninthedistrict.她讨厌他吹嘘自己是这个地区最有影响力的人。it作形式宾语4.一些“动词＋介词”构成的短语，如dependon，relyon，seeto，stickto，take...forgranted，owe...tosb/sth等后接that从句时，须用it作形式宾语。Wouldyouseetoitthatshegetshomeearly?你负责保证她早点到家，好吗？Youcan’tdependonit

thathewillkeephispromisethathewillmountthetopofthemountain.你不能指望他会遵守他要登上山顶的诺言。Heowesittohiscomrade’shelp

thathehasmadegreatprogressinEnglish.他把在英语方面取得的巨大进步归功于朋友的帮助。SummaryThered-earedslider,aspeciesoffreshwaterturtle,isnativetotheSouthernUnitedStatesandNorthernMexico.Duetoitscuteappearance,manypeoplethinkkeepingthisturtleasapetisagoodidea.Recentyearshaveseenmoreandmorepetslidersescapingorbeingreleasedfromhomes,andsomeownersbelievetoreleasethemintothewildisnobigissue.Thesedays,peoplehavefoundtoreleasetheseturtlesintothewildisathreattootherspecies.Expertsconsiderownerskeepingtheirpetsinanenclosedareaimportant,andanyoneunabletokeeptheirpetsshouldtakethemtoanappropriateanimalshelter.Rewritetheunderlinedpartsusing

it

asanemptyobject.红耳滑水龟（巴西龟）Thered-earedslider,aspeciesoffreshwaterturtle,isnativetotheSouthernUnitedStatesandNorthernMexico.Duetoitscuteappearance,manypeoplethinkkeepingthisturtleasapetisagoodidea.Recentyearshaveseenmoreandmorepetslidersescapingorbeingreleasedfromhomes,andsomeownersbelievetoreleasethemintothewildisnobigissue.manypeoplethinkit

agoodideatokeepthisturtleasapet.Rewritetheunderlinedpartsusing

it

asanemptyobject.believeit

nobigissuetoreleasethemintothewildThesedays,peoplehavefoundtoreleasetheseturtlesintothewildisathreattootherspecies.Expertsconsiderownerskeepingtheirpetsinanenclosedareaimportant,andanyoneunabletokeeptheirpetsshouldtakethemtoanappropriateanimalshelter.Rewritetheunderlinedpartsusing

it

asanemptyobject.红耳滑水龟（巴西龟）peoplehavefound

it

athreat

tootherspeciestoreleasetheseturtlesintothewildExpertsconsiderit

importantforownerstokeeptheirpetsinanenclosedareaLocatedinChengdeCity,HebeiProvince,Saihanba

sits450kilometerstothenorthofBeijing.Theplaceiscoveredwithsnowsevenmonthsayear.Itusedtobeafreezing,barrendesertplaguedbysandstorms.However,ithasbeenturnedintotheworld’slargesthuman-madeforestthatcoversanareaofnearly75,000hectares.Thus,itiscalleda“greenmiracle.”theSaihanbaNationalForestPark塞罕坝国家森林公园（河北承德）Describethechangesusingitasanemptyobject.presentday1960stheSaihanbaNationalForestPark塞罕坝国家森林公园（河北承德）nouns/adjectivestodo/thatbreakthroughimpossiblelikelyunrealistic...growinvestigateplanttreestransform...Ithinkitabreakthroughtotransformadesertintoaforest...presentday1960stheSaihanbaNationalForestPark塞罕坝国家森林公园（河北承德）Ithinkitabreakthroughtotransformadesertintoaforest...Ithinkitimpossibletogrowtreesthereinthe1960s.IthinkitunrealistictoplanttreesinthedesertwhentheworkersfirstcametoSaihanba.IthinkitlikelytoinvestigatethebiodiversityintheSaihanbaNationalForestParknow.End高中新外研版选择性必修二EcosystemsProducersabsorbwateranddissolvednutrientsfromthesoil.Theyalsomaketheirownfoodbyabsorbinglightfromthesun.Primaryconsumersrelyonvegetationtoprovideenergy.Theyfeedongreenplants.Secondaryconsumerspreyonprimaryconsumers,aswellaseatingotheranimalmatter.Decomposersbreakdowndeadanimalandvegetablematterintonutrients.Thedissolvedchemicalsarethenreleasedbackintothefoodchain,tobeusedbyproducers.Lookatthediagram.Payattentiontotheexpressionsinbold.1Whatdoesthediagramshow?2Whataretherelationshipsbetweenthelivingthings?Lookatthediagramandanswerthequestions.Thediagramshowsafoodchain—theconnectionbetweenthelivingthings.Thelivingthingsarecloselyconnectedwitheachotherbythefoodtheyeat.Secondaryconsumerspreyonprimaryconsumers,primaryconsumersfeedonproducers,andproducersabsorblightfromthesun,andwateranddissolvednutrientsfromthesoil,whichareprovidedbydecomposers.absorbdissolvednutrientsrelyonprovideenergyfeedonpreyonbreakdownreleased吸收（takein）溶解养分依靠提供能量以……为食捕食分解释放ReviewCompletethepassagewiththecorrectformofthewordsandexpressionsinActivity5.Inawoodlandecosystem,treesandotherplantsareproducers.They1____________water,andtakeinnutrientsfromthesoilandenergyfromthesun.Insectsareanexampleofaprimaryconsumer.They2____________theproducerstoprovidefoodforthem,andare3____________bysecondaryconsumers:smallmammalsandbirds.They4____________theprimaryconsumers.Fungiandbacteriaaredecomposers.They5____________animalwasteandtheremainsoflivingthings.Thechemicalsthesedecomposers6____________fertilisethesoilandgivetheplantsthenutrientstheyneedtogrow.absorbrelyonfedonbreakdownpreyonreleaseLearningobjectivesTolearnsomethingaboutecosystemsTolistentotheconversationandgetthedetailedinformationaboutwhatmakesbeehabitatsdangerousTothinkhowanimalsandhumanbeingsrelyoneachothertoliveontheearthListening•Oneoftheoldestspeciesintheecosystem,thehoneybeehasbeeninexistenceformillionsofyears.•Ahoneybeecanflyasfastas24kilometresperhouranditswingscanbeat200timespersecond.•Injustonejourneytocollectpollenandnectar,onesinglehoneybeecanpollinateasmanyas50to100flowers.Pre-listeningDidYouKnow?pollen/ˈpɒlən/n.花粉nectar/ˈnɛktə/n.花蜜pollinate/ˈpɒlɪˌneɪt/v.给……传授花粉declining

(decline的现在分词)dieout

foodsupplyberesponsibleforbeunabletoreproducecompensatefor

thelossofratherexaggeratednumerous下降灭绝食物供应是……的原因；对……负责不能繁殖弥补(makeupfor)……的损失相当夸张许多的(many)Pre-listeninglookingonthebrightsideaccordingtostatisticsacombinationofduetodamagetocausedbymaincauseinthatcase看好的一面根据统计数据……的结合由于损害，破坏由……导致主要原因在那种情况下Pre-listening1Beesareveryimportanttoourfoodsupplybecausetheyprovidehoney.2Thebeepopulationisdeclining.3Withoutbees,humanswoulddieout.4Allhumancropsdependonbeesforpollination.5Ifbeesbecameextinct,otherinsectscouldpollinateenoughcrops.6Humansareresponsibleforthedeclineinthebeepopulation.ListeningListentotheconversationandchoosethetruestatements.Listenagainandcompletetheflowchart.ListeningListeningAcombinationofthingsdamagesbeehabitats,mainly1______________________________.Thebeepopulationis2________________.Accordingtostatistics,beenumbersintheUS3_______________________injustoneyear.pesticidesandclimatechangedecliningveryquicklyhavefallenby17%ListeningWithoutbees,cropswould4____________________________.5_____________wouldnotbeabletocompensateforthelossofbees,because6________________________________________ofthespeciesofcrops.Animalsthatliveonthecrops7____________________________.Humanshavenothingtoeatanddieout.beunabletoreproduceOtherinsectsbeesareresponsibleforpollinatingabout70%woulddieoutListeningMeg:HeyOllie,haveyouheardthatthebeepopulationisdeclining?Ollie:

No,Ihaven’t.But,thinkingaboutit,Ihardlyeverseebeesthesedays.WhenIwaslittle,theyseemedtobeeverywhere!Meg:If

beesdieout,humanswilldieouttoo.Ollie:

What?!Youmustbekidding!

Idon’tbelieveit!Meg:It’safact!!Iwatchedanaturedocumentaryallaboutittheotherevening.Beesareveryimportanttoourfoodsupply.Ollie:Howcanthatbepossible?Humanswon’tdieoutjustbecausethere’snohoney!ListeningMeg:Beesdon’tjustmakehoney.Don’tforgetthatbeesarealsoresponsibleforpollinatingplants.Withoutthem,cropswouldbeunabletoreproduce.Ollie:

Butsurelythereareotherwaysofgettingthesecropstoreproduce.Doesithavetobebees?Meg:Well,thereareotherinsectsthatpollinateplants,butit’sunlikelythattheywouldbeabletofullycompensateforthelossofbees.Beesareresponsiblefor