新选择性必修二Unit5AdelicateworldPeriod2Usinglanguage课件

外研版英语选择性必修第二册

Unit5AdelicateworldPeriod2Usinglanguages

Part1Grammar

Studytheruleofitasemptyobject

a.NovisitorswouldthinkitsurprisingthattheislandisaUNESCOWorldHeritageSite.

b.NovisitorswouldthinkthatislandbeingaUNESCOWorldHeritageSiteissurprising.1.Whatdoes“it”refertoinsentence(a)?Insentences(a)refersto

“thattheislandisaUNESCOWorldHeritageSite”

c.Expertsfeltitnecessary

tocomeupwithaplantoremovealltherabbitsfromtheisland.d.Expertsfelttocomeupwithaplantoremovealltherabbitsfromtheislandwasnecessary.2.Whatdoes“it”refertoinsentence(c)?Insentences(c)refersto“tocomeupwithaplantoremovealltherabbitsfromtheisland”

Comparethesentencesineachgroup

3.Whatisthedifferencebetweenthesentencesineachgroup?Inthe1stgroup,theobjectofthe1stsentenceisreplacedby“it”,whileInthe2ntsentence,theobjectclauseisinthepositionoftheobject.Inthe2ndgroup,theobjectofthe1stsentenceisreplacedby“it”,whileinthe2ndsentence,theinfintiveisinthepositionoftheobject.

Moresentenceswithitasanemptyobject1.Thisincidentmadeitclearthattherat,mouseandrabbitproblemneededsolvingonceandforall.2....butwehumansoweittotheislandtogiveitahappyending.Notes:Tobalancesentencestructure,theautherusedanemptyobjecttoreplacestoolonginfinitivestructuresorobjectclause.Practice1Rewritetheunderlinedpartsusingitasanemptyobject.1.Duetoitscuteappearance,manypeoplethinkkeepingthisturtleasapetisagoodidea.2.andsomeownersbelievetoreleasethemintothewildisnobigissue.Duetoitscuteappearance,manypeoplethink

it

agoodideatokeepthisturtleasapetisandsomeownersbelieveitnobigissuetoreleasethemintothewild.3.Thesedays,peoplehavefoundtoreleasetheseturtlesintothewildisathreattootherspecies.4.ExpertsconsiderownerskeepingtheirpetsinanenclosedareaimportantThesedays,peoplehavefounditathreattootherspeciestoreleasetheseturtlesintothewild.

Expertsconsiderowersitimportantforownerstokeeptheirpetsinanenclosedarea.Practice2Describethechangeshappeningtotheparks,usingitasanemptyobject.theSaihanbaNationalForestParknouns/adjectivestodo/that-clausebreakthroughgrowimpossibleinvestigatelikelyplanttreesunrealistictransformeg.Ithinkitabreakthroughtotransformadesertintoaforest.Possibleanswers:1.Ibelieveitlikelythatmorevolunteerswillhelpplantmoretreesaroundthepark.2.Ifinditimpossibletoinvestigateallthelivingspeciesintheparkatpresent.3.Ifeelitunrealisticforthelocalpeopletogrowriceandwheatforgianindustry.EcosytemsBeforelisteningFoodchainsandenergyexchangeDecomposersbreakdowndeadanimialandvegetablematterintonutrients.Thedissolvedchemicalsarethenreleasedbackintothefoodchain,tobeusedbyproducers.

1.Whatdoesthediagramshow?2.Whataretherelationshipsbetweenthelivingthings?

Everythingintheworldisrelatedtoeachother.Creaturesinnaturedependuponeachotherandcoexsitwitheachother.

TalkaboutecosytemsListeningListentotheconversationandchoosethetruestatements.1.Beesareveryimportanttoourfoodsupplybecausetheyprovidehoney.2.Thebeepopulationisdeclining.3.Withoutbees,humanswoulddieout.4.Allhumancropsdependonbeesforpollination.5.Ifbeesbecomeextinct,otherinsectscouldpollinateenoughcrops.6.Humansareresponsibleforthedeclineinthebeepopulation.Youranswer:____________

KnowmoreaboutecosytemsINawoodlandecosytem,treesandotherplantsareproducers.They1.___________water,andtakeinnutrientsfromthesoilandenergyfromthesun.Insectsareanexampleofaprimaryconsumer.They2.________theproducerstoprovidefoodforthem,andare3.______________bysecondaryconsumers:smallmammalsandbirds.They4.__________theprimarycomsumers.worms,fungiandbacteriaaredecomposers.They5._____________animalswasteandtheremainsofthelivingthings.Thechemicalsthesedecomposers6___________fertilisethesoilandgivetheplantsthenutrientstheyneedtogrow.

absorbrelyonpreyedon

feedon

breakdown

releasePostlistening1

Learnhowtoexpressyourdoubtorrespondtodoubt.1Youmustbekidding!2Idon'tbelieveit!3It'safact!4Don'tforgetthat...5Areyousureabout...?6Checkitoutforyourself...7Accordingtostatistics...ExpressingdoubtRespondingtodoubt1,2,53,4,6,7Postlistening2Workinpairs.Talkaboutwhatwouldhappentotheecosytemifanotherspeciesdiedout.Reference:Everyorganismplaysanirreplaceableroleintheecosystem,eventhemouseorakindofpests.Theextinctionofoneorganismmayleadtothelackoffoodforothers,whilesomeorganismsmaylosetheirnaturalenemiesandhaveuncontrollednumbers,thusaffectingthewholeecosystemandthewholebiosphere.

Listenagain

1.____________2.____________3.____________4.____________5.____________6.____________7.____________

Languageappreciation

1.Recentyearshaveseenmoreandmorepetslidersescapingorbeingreleasedfromhomes.•[句式分析]本句主谓部分采用“时间+haveseen”,其中see意为“见证经历”，注意主谓人称数的一致性；seesb/sthdoing表示看见正在进行，seesb/sthbeingdone表示看见正在被执行的动作。•[尝试翻译]近年来，越来越多的宠物龟逃出家门或被放生。

Languageappreciation

2.Injustonejourneytocollectpollenandnectar,onesinglehoneybeepollinateasm