北師大版高中英語選擇性必修第一冊UNIT3 Section Ⅰ Period2課件

Period２UNIT3

CONSERVATION主題語境人與自然——人類生存、社會發(fā)展與環(huán)境的關(guān)系SectionⅠ

TOPICTALK&LESSON11．Whatdoesthepassagemainlytalkabout？A．Thesixthextinction．B．Theextinctionsinhistory．C．Thestepstoavoidextinction．D．Thereasonforextinction．課時練案課文整體閱讀√2．What'sthemainideaofparagraph2？A．Speciesdieoutnaturally．B．Howquicklyspeciesdieout．C．Whysomanyspeciesaredyingout．D．Whateffecthumanactivityhasonspecies．√Readthetextcarefullyandthenchoosethebestanswer．1．Whendiddinosaursdieoutaccordingtothepassage？A．Morethan500millionyearsago．B．Morethan66millionyearsago．C．Inthethirdmassextinction．D．Inthefourthmassextinction．√2．Whichofthefollowingisoneofunnaturalreasonsforextinctions？A．Volcaniceruptions．B．AsteroidshittingtheEarth．C．Changesinsealevels．D．Airandwaterpollution．√3．WhathasmadethespeciesonEarthdieoutatahigherrate？A．Naturalcauses．B．Globalwarming．C．Humanactivity．D．Nocleanwater．√4．Whydoweneedtochangethewaywelivenow？A．Toavoidasixthextinction．B．Tolivewithothersinpeace．C．Tosavenaturalsourcesofenergy．D．Toworkbetterandtravelfaster．√1．Howmuchdoyouknowaboutextinction？Shareitwithyourclassmates．___________________________________________________________2．Whatshouldwedotoavoidspeciesextinction？___________________________________________________________[答案]略includingvariedoutaffectedoccursatwayhowImprovedestroying1．huntvi．&vt．獵取，獵殺；

搜尋，搜索；

追蹤，追捕①(教材p.110)Yes，manyanimalsareillegallyhuntedforsomethingtheyhave． ________②Parentbirdsbegantohuntforfoodfortheiryoung． ______________③Thepolicearehuntinganescapedcriminal． ______________vt．獵殺vi．搜尋，搜索vt．追蹤，追捕2．massadj．大量的

n．民眾；團；塊；堆；大量；許多①(教材p.52)Theseincludethethirdmassextinction，knownasthe“GreatDying”，whichkilled90%to96%ofallspecies． ___________②Thehillappearedasablackmassinthedistance．

__________③There'samassofworkforhertodo． _____________④Hismusiciscommercial．Itisaimedatthemasses． _______adj．大量的n．塊；堆n．大量；許多n．民眾3．decreasen．減少；減少的量vi．&vt．減少①(教材p.52)Accordingtoscientists，theyincludevolcaniceruptions，asteroidshittingtheEarthfromspace，changesinsealevels，thedecreaseoftheoxygencontentoftheseaandglobalwarming．

__________________②Theydecreasedthesizeofthegroupfrom25to15． ________③Thedecreaseinsaleswasalmost20percent． _________________n．減少；減少的量vt．減少n．減少；減少的量4．a(chǎn)ffectvt．影響；侵襲；使感染；(感情上)深深打動；使悲傷①(教材p.53)ItisclearthathumanactivityhasnegativelyaffectedallotherspeciesonEarth，includinganimalsandplants．

_______②Theyweredeeplyaffectedbythenewsofherdeath． ________________③Arthritisisacripplingdiseasewhichaffectspeopleallovertheworld． ______影響深深打動；使悲傷使感染1．(學(xué)會斷句)Althoughitisnotunusual/forspeciestodieoutnaturally，therate/atwhichthisisnowhappening/iscauseforconcern．[分析]本句是一個______。句中Althoughitisnotunusualforspeciestodieoutnaturally為________從句；主句中的atwhichthisisnowhappening為限制性定語從句，修飾先行詞_______。[翻譯]_____________________________________________________復(fù)合句讓步狀語therate雖然物種的自然滅絕并不罕見，但現(xiàn)在滅絕的速度讓人擔(dān)憂。2．(學(xué)會斷句)A2015studybyscientists/whowerebasedatBrownUniversityandDukeUniversity/intheUS，lookedathowquicklyspeciesdieout/duetonaturalcauses，thatis，the“backgroundextinctionrate”．[分析]本句是一個復(fù)合句。A2015study為句子的____，lookedat為____，howquicklyspeciesdieoutduetonaturalcauses是____從句；句中whowerebasedatBrownUniversityandDukeUniversityintheUS為限制性定語從句，修飾先行詞__________。[翻譯]_______________________________________________________________________________________________________________主語謂語賓語scientists

美國布朗大學(xué)和杜克大學(xué)的科學(xué)家們于2015年進行了一項研究，考察了自然原因?qū)е挛锓N滅絕的速度，即“背景滅絕率”。3．(學(xué)會斷句)Ifasixthmassextinctionoccurs，scientists/whohavestudiedtheissue/believe/thatuptothreequartersofallspeciesonEarth/coulddieout．[分析]本句是一個復(fù)合句。句中Ifasixthmassextinctionoccurs為________從句；whohavestudiedtheissue為限制性定語從句，修飾先行詞__________；thatuptothreequartersofallspeciesonEarthcoulddieout是____從句。[翻譯]_______________________________________________________________________________________________________________條件狀語scientists賓語

研究這個問題的科學(xué)家們認(rèn)為，如果第六次大滅絕發(fā)生，地球上多達四分之三的物種可能就會滅絕。4．(學(xué)會斷句)Inshort，ifwewanttosurvive，weneedtostopdestroyingtheplanet/thatweliveon/andstarttoprotectit．[分析]本句是一個復(fù)合句。句中ifwewanttosurvive為________從句；thatweliveon為限制性定語從句，修飾先行詞_________；starttoprotectit和tostopdestroyingtheplanet是并列結(jié)構(gòu)，作need的____。[翻譯]_______________________________________________________________________________________________________________條件狀語theplanet賓語

簡而言之，如果我們想要生存，我們需要停止破壞我們賴以生存的星球，并開始保護它。1．(應(yīng)用文佳句)Thereasonsforextinctionsarevaried．滅絕的原因多種多樣。2．(應(yīng)用文佳句)Thereisalonglistofreasonswhysomanyspeciesaredyingout：airandwaterpollution，forestsbeingdestroyed，factoryfarmingandoverfishing．造成如此多的物種滅絕的原因有很多：空氣和水污染、森林被破壞、工業(yè)化種植和過度捕撈。3．(應(yīng)用文佳句)Ofcourse，aswehumansdependonsomanyspeciesforou