北师大版高中英语选择性必修第一册UNIT3 Section Ⅰ Period2课件

Period２UNIT3

CONSERVATION主题语境人与自然——人类生存、社会发展与环境的关系SectionⅠ

TOPICTALK&LESSON11．Whatdoesthepassagemainlytalkabout？A．Thesixthextinction．B．Theextinctionsinhistory．C．Thestepstoavoidextinction．D．Thereasonforextinction．课时练案课文整体阅读√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．猎取，猎杀；

搜寻，搜索；

追踪，追捕①(教材p.110)Yes，manyanimalsareillegallyhuntedforsomethingtheyhave． ________②Parentbirdsbegantohuntforfoodfortheiryoung． ______________③Thepolicearehuntinganescapedcriminal． ______________vt．猎杀vi．搜寻，搜索vt．追踪，追捕2．massadj．大量的

n．民众；团；块；堆；大量；许多①(教材p.52)Theseincludethethirdmassextinction，knownasthe“GreatDying”，whichkilled90%to96%ofallspecies． ___________②Thehillappearedasablackmassinthedistance．

__________③There'samassofworkforhertodo． _____________④Hismusiciscommercial．Itisaimedatthemasses． _______adj．大量的n．块；堆n．大量；许多n．民众3．decreasen．减少；减少的量vi．&vt．减少①(教材p.52)Accordingtoscientists，theyincludevolcaniceruptions，asteroidshittingtheEarthfromspace，changesinsealevels，thedecreaseoftheoxygencontentoftheseaandglobalwarming．

__________________②Theydecreasedthesizeofthegroupfrom25to15． ________③Thedecreaseinsaleswasalmost20percent． _________________n．减少；减少的量vt．减少n．减少；减少的量4．affectvt．影响；侵袭；使感染；(感情上)深深打动；使悲伤①(教材p.53)ItisclearthathumanactivityhasnegativelyaffectedallotherspeciesonEarth，includinganimalsandplants．

_______②Theyweredeeplyaffectedbythenewsofherdeath． ________________③Arthritisisacripplingdiseasewhichaffectspeopleallovertheworld． ______影响深深打动；使悲伤使感染1．(学会断句)Althoughitisnotunusual/forspeciestodieoutnaturally，therate/atwhichthisisnowhappening/iscauseforconcern．[分析]本句是一个______。句中Althoughitisnotunusualforspeciestodieoutnaturally为________从句；主句中的atwhichthisisnowhappening为限制性定语从句，修饰先行词_______。[翻译]_____________________________________________________复合句让步状语therate虽然物种的自然灭绝并不罕见，但现在灭绝的速度让人担忧。2．(学会断句)A2015studybyscientists/whowerebasedatBrownUniversityandDukeUniversity/intheUS，lookedathowquicklyspeciesdieout/duetonaturalcauses，thatis，the“backgroundextinctionrate”．[分析]本句是一个复合句。A2015study为句子的____，lookedat为____，howquicklyspeciesdieoutduetonaturalcauses是____从句；句中whowerebasedatBrownUniversityandDukeUniversityintheUS为限制性定语从句，修饰先行词__________。[翻译]_______________________________________________________________________________________________________________主语谓语宾语scientists

美国布朗大学和杜克大学的科学家们于2015年进行了一项研究，考察了自然原因导致物种灭绝的速度，即“背景灭绝率”。3．(学会断句)Ifasixthmassextinctionoccurs，scientists/whohavestudiedtheissue/believe/thatuptothreequartersofallspeciesonEarth/coulddieout．[分析]本句是一个复合句。句中Ifasixthmassextinctionoccurs为________从句；whohavestudiedtheissue为限制性定语从句，修饰先行词__________；thatuptothreequartersofallspeciesonEarthcoulddieout是____从句。[翻译]_______________________________________________________________________________________________________________条件状语scientists宾语

研究这个问题的科学家们认为，如果第六次大灭绝发生，地球上多达四分之三的物种可能就会灭绝。4．(学会断句)Inshort，ifwewanttosurvive，weneedtostopdestroyingtheplanet/thatweliveon/andstarttoprotectit．[分析]本句是一个复合句。句中ifwewanttosurvive为________从句；thatweliveon为限制性定语从句，修饰先行词_________；starttoprotectit和tostopdestroyingtheplanet是并列结构，作need的____。[翻译]_______________________________________________________________________________________________________________条件状语theplanet宾语

简而言之，如果我们想要生存，我们需要停止破坏我们赖以生存的星球，并开始保护它。1．(应用文佳句)Thereasonsforextinctionsarevaried．灭绝的原因多种多样。2．(应用文佳句)Thereisalonglistofreasonswhysomanyspeciesaredyingout：airandwaterpollution，forestsbeingdestroyed，factoryfarmingandoverfishing．造成如此多的物种灭绝的原因有很多：空气和水污染、森林被破坏、工业化种植和过度捕捞。3．(应用文佳句)Ofcourse，aswehumansdependonsomanyspeciesforou