Unit3 正文学案-高中英语人教版（2019）选择性必修第三册

高二英语XB3Unit3正文学案Geniusistheabilitytoendlessworkhard.天才就是无止境刻苦勤奋的能力。编辑：使用日期：·编辑：使用日期：高二XB3Unit3高二XB3Unit3正文学案校对：审核：审核：学习目标。1.Toenhancethereadingandwritingskills; 2.Tofigureoutthestructureandthelanguagefeaturesofthetext.;二、读文章,梳理知识点。CLIMATECHANGEREQUIRESTHEWORLD'SATTENTION气候变化需要全世界的关注Wehaveknownaboutclimatechangefordecades.（1）ThereislittledoubtthatEarthisgettingwarmerandwarmer(seethegraph).Awarmingoceanandatmospherealongwithmeltingiceandrisingsealevelsprovideevidenceofadramaticchangeintheglobalclimate.我们了解气候变化已有几十年了。毫无疑问，地球正变得越来越暖海洋和大气变暖，冰川融化，海平面上升提供全球气候急剧变化的证据。本句是复合句，that引导同位语从句In2013,alotofpeoplewereshockedbyanewsphotoofadeadpolarbear（2）thatwasfoundonNorway'sArcticislandofSvalbard.Accordingtothescientistswhofounditsdeadbody,allthatremainedofthepolarbearwas“skinandbones”.Anexpertwhohasstudiedpolarbearsformanyyearssaidthatfromthepositionofitsdeadbody,thebearappearedtohavestarvedanddied.Expertsclaimedthatlowsea-icelevels（3）causedbyclimatechangemeantthebearcouldnothuntsealsasbefore,soithadtotravelgreaterdistancesinordertofindfood.ThisalarmingcaseshowedhowtheincreaseintemperaturehadanimpactonEarthsecology.2013年，很多人都被挪威北极斯瓦尔巴特岛发现的一只北极熊尸体的新闻照片震惊了。据发现它尸体的科学家说，北极熊只剩下“皮包骨头”。一位研究北极熊多年的专家说，从它的尸体位置来看，这只熊似乎是饿死了。专家称，气候变化导致的海冰水平降低意味着北极熊不能像以前那样捕食海豹，因此它必须跋涉更远的距离来寻找食物。这个令人震惊的例子显示了温度的上升对地球生态的影响。定语从句过去分词作定语Thenwhatiscausingtheincreaseintheglobalaveragesurfacetemperature?Climatescientistsoftenmentionakeyclimateprocess（4）calledthe“qreenhouseeffect,（5）whichhastwocommonmeanings:the“natural”greenhouseeffectandthe“manmade”greenhouseeffect.The“natural”greenhouseeffectreferstothefactt（6）hatheatfromthesunenterstheatmosphereandwarmsEarth’ssurfaceasshort-waveradiation.Theheatisreleasedbackintospaceatlongerwavelengths.Greenhousegasesintheatmospheresuchasmethaneandcarbondioxidetrapsomeoftheheat,（7）keepingEarth’sclimatewarmandhabitable.Withoutthisprocess,Earthcouldnotsustainlife.However,the“man-made”greenhouseeffecthasnowbecomeabigproblem.Whenpeopleproducehugeamountsofextragreenhousegasesbyburningfossilfuels,moreheatenergyistrappedintheatmosphereandcausesEarth'ssurfacetemperaturetorisequickly.那么是什么导致了全球平均地表温度的上升呢?气候科学家经常提到一个叫做“温室效应”的关键气候过程，它有两个共同的含义:“自然”温室效应和“人为”温室效应。“自然”温室效应指的是太阳的热量进入大气层，以短波辐射的形式使地球表面变暖。热量以更长的波长释放回太空。大气中的温室气体，如甲烷和二氧化碳，捕获了一些热量，使地球气候温暖宜居。没有这一过程，地球就无法维持生命。然而，“人为的”温室效应现在已经成为一个大问题。当人们通过燃烧化石燃料产生大量额外的温室气体时，更多的热能被困在大气中，导致地球表面温度迅速上升。过去分词做定语非限制性定语从句，且是复合句引导同位语从句现在分词做结果状语，warmandhabitable形容词做宾补（8）Thereisstrongandcomprehensiveevidencethattheriseintemperaturehasledtoanincreaseinextremeweatherandnaturaldisastersworldwidenotonlycausingseriousdamage,butalsocostinghumanlives.Climatescientistshavewarnedthatifwedonottakeappropriateactions,thiswarmingtrendwillprobablycontinueandtherewillbeahigherpricetopay.Infactnewsreportsarefrequentlybroadcastaboutextremerainstormsandheatwaves（9）causingdeathsandeconomiclosses.有力和全面的证据表明，气温上升已导致全球极端天气和自然灾害的增加，不仅造成严重的破坏，而且夺去了人的生命。气候科学家警告说，如果我们不采取适当的行动，这种变暖趋势可能会继续下去，并将付出更高的代价。事实上，关于极端暴雨和热浪造成死亡和经济损失的新闻报道经常被广播。整句是复合句，Thereisstrongandcomprehensiveevidence是主句，that引导同位语从句，notonlycausingseriousdamage,butalsocostinghumanlives是现在分词作结果状语后置定语Continuedgreenhousegasemissionswillresultinfurtherwarmingandlong-lastingchangestotheglobalclimate.Thisrequirestheattentionofpeopleallovertheworld.Governmentsneed（10）toconsidermakingpoliciesandtakingappropriateactionsandmeasures（11）toreducegreenhousegasemissions.Weasindividualscanalsoreduceour“carbonfootprint”byrestrictingtheamountofcarbondioxideourlifestylesproduce.Itisourresponsibilitytoseizeeveryopportunitytoeducateeveryoneaboutglobalwarming,alongwithitscausesandimpacts,becausethisisthemostseriousissueaffectingallofusont