Unit+5+A+Delicate+World+Using+language+高中英語外研版（2019）選擇性必修二

Itasanemptyobject高中新外研版選擇性必修二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動詞＋it＋形容詞/名詞＋(for/ofsb)＋todo/that...it作形式賓語it作形式賓語1.動詞＋it＋形容詞/名詞＋(for/ofsb)＋todo/that...Wemake

itaruletovisit

theoldeveryweekend.我們規(guī)定每個周末都去看望那些老人們。Idon’tfeel

itdifficultforme

totackle

theproblem.我覺得解決這個問題并不難。Theyconsidered

itvitalthattheyshouldkeeptheirnaturalhabitat.他們認為保持它們的自然棲息地很重要。Itasanemptyobjectit作形式賓語2.動詞＋it＋nogood/nouse/useless/awasteoftime/worthwhile＋doing...I’llmake

itworthwhile

tellingmeabouthissecret.告訴我他的秘密，我會酬謝你的。Hethought

itnousetryingtomultiplytheirnumber.他認為企圖增加它們的數(shù)量沒有用。it作形式賓語3.動詞appreciate/hate/love/like/dislike后面接if或when引導的從句作賓語時，中間需用形式賓語it，構成“appreciate/hate/love/like/dislike＋it＋if/when從句”。Hewillappreciateit

iftheyassisthimtotacklethedifficultproblem.如果他們幫他解決這個難題，他將非常感激。Shehated

it

whenhebraggedthathewasthemostinfluentialmaninthedistrict.她討厭他吹噓自己是這個地區(qū)最有影響力的人。it作形式賓語4.一些“動詞＋介詞”構成的短語，如dependon，relyon，seeto，stickto，take...forgranted，owe...tosb/sth等后接that從句時，須用it作形式賓語。Wouldyouseetoitthatshegetshomeearly?你負責保證她早點到家，好嗎？Youcan’tdependonit

thathewillkeephispromisethathewillmountthetopofthemountain.你不能指望他會遵守他要登上山頂?shù)闹Z言。Heowesittohiscomrade’shelp

thathehasmadegreatprogressinEnglish.他把在英語方面取得的巨大進步歸功于朋友的幫助。SummaryThered-earedslider,aspeciesoffreshwaterturtle,isnativetotheSouthernUnitedStatesandNorthernMexico.Duetoitscuteappearance,manypeoplethinkkeepingthisturtleasapetisagoodidea.Recentyearshaveseenmoreandmorepetslidersescapingorbeingreleasedfromhomes,andsomeownersbelievetoreleasethemintothewildisnobigissue.Thesedays,peoplehavefoundtoreleasetheseturtlesintothewildisathreattootherspecies.Expertsconsiderownerskeepingtheirpetsinanenclosedareaimportant,andanyoneunabletokeeptheirpetsshouldtakethemtoanappropriateanimalshelter.Rewritetheunderlinedpartsusing

it

asanemptyobject.紅耳滑水龜（巴西龜）Thered-earedslider,aspeciesoffreshwaterturtle,isnativetotheSouthernUnitedStatesandNorthernMexico.Duetoitscuteappearance,manypeoplethinkkeepingthisturtleasapetisagoodidea.Recentyearshaveseenmoreandmorepetslidersescapingorbeingreleasedfromhomes,andsomeownersbelievetoreleasethemintothewildisnobigissue.manypeoplethinkit

agoodideatokeepthisturtleasapet.Rewritetheunderlinedpartsusing

it

asanemptyobject.believeit

nobigissuetoreleasethemintothewildThesedays,peoplehavefoundtoreleasetheseturtlesintothewildisathreattootherspecies.Expertsconsiderownerskeepingtheirpetsinanenclosedareaimportant,andanyoneunabletokeeptheirpetsshouldtakethemtoanappropriateanimalshelter.Rewritetheunderlinedpartsusing

it

asanemptyobject.紅耳滑水龜（巴西龜）peoplehavefound

it

athreat

tootherspeciestoreleasetheseturtlesintothewildExpertsconsiderit

importantforownerstokeeptheirpetsinanenclosedareaLocatedinChengdeCity,HebeiProvince,Saihanba

sits450kilometerstothenorthofBeijing.Theplaceiscoveredwithsnowsevenmonthsayear.Itusedtobeafreezing,barrendesertplaguedbysandstorms.However,ithasbeenturnedintotheworld’slargesthuman-madeforestthatcoversanareaofnearly75,000hectares.Thus,itiscalleda“greenmiracle.”theSaihanbaNationalForestPark塞罕壩國家森林公園（河北承德）Describethechangesusingitasanemptyobject.presentday1960stheSaihanbaNationalForestPark塞罕壩國家森林公園（河北承德）nouns/adjectivestodo/thatbreakthroughimpossiblelikelyunrealistic...growinvestigateplanttreestransform...Ithinkitabreakthroughtotransformadesertintoaforest...presentday1960stheSaihanbaNationalForestPark塞罕壩國家森林公園（河北承德）Ithinkitabreakthroughtotransformadesertintoaforest...Ithinkitimpossibletogrowtreesthereinthe1960s.IthinkitunrealistictoplanttreesinthedesertwhentheworkersfirstcametoSaihanba.IthinkitlikelytoinvestigatethebiodiversityintheSaihanbaNationalForestParknow.End高中新外研版選擇性必修二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）溶解養(yǎng)分依靠提供能量以……為食捕食分解釋放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/?p?l?n/n.花粉nectar/?n?kt?/n.花蜜pollinate/?p?l??ne?t/v.給……傳授花粉declining

(decline的現(xiàn)在分詞)dieout

foodsupplyberesponsibleforbeunabletoreproducecompensatefor

thelossofratherexaggeratednumerous下降滅絕食物供應是……的原因；對……負責不能繁殖彌補(makeupfor)……的損失相當夸張許多的(many)Pre-listeninglookingonthebrightsideaccordingtostatisticsacombinationofduetodamagetocausedbymaincauseinthatcase看好的一面根據(jù)統(tǒng)計數(shù)據(jù)……的結合由于損害，破壞由……導致主要原因在那種情況下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