高级英语1 lesson 3课后练习答案及补充练习

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1、Lesson3ShipsintheDesert课后练习答案及补充练习习题全解I.　1)ThewriterwenttotheAralSeatosearchfortheunderlyingcausesoftheenvironmentalcrisis.Whathesawtherewashotdrysand.　2)Itwastheannuallayersoficeinacoresampledugfromtheglacier.　3)Scientistsweremonitoringtheairseveraltimesadayto

2、chartthecourseoftheclimatechange.　4)Becausethepolarcapplaysacrucialroleintheworld'sweathersystem,thethinningofthepolarcapmightcausefloodinmanyplacesoftheworld.　5)TherearemoredifferentspeciesofbirdsineachsquaremileoftheAmazonthanexistinallofNorthAmerica.Thedestr

3、uctionoftheAmazonrainforestwillmeansilencingthousandsofsongswehaveneverevenheard.　6)Thewritercallsnoctilucentclouds"ghostsinthesky".Asaresultofpollution,thecloudsoccasionallyappearwhentheearthisfirstcloakedintheeveningdarkness.Andtheyappearmoreoftenbecauseofahu

4、gebuildupofmethanegasintheatmosphere.　7)Becausewearenotyetawakenedtotakeeffectivemeasurestodealwiththeclimatechange.　8)Carbondioxide'sabilitytotrapheatintheatmospherecausesglobalwarming.Becauseglobalwarmingseriouslythreatenstheglobalclimateequilibriumthatdeterm

5、inesthepat-ternofwinds,rainfall,surfacetemperatures,oceancur-rents,andsealevel.Theseinturndeterminethedistributionofvegetativeandanimallifeonlandandseaandhaveagreateffectonthelocationandpatternofhumansocieties.　9)Thetwokeyfactorsarehumanpopulationandthescientif

6、icandtechnologicaldevelopment.Thedramaticchangesthathaveoccurredinthesetwofactorsareasuddenandstartlingsurgeinhumanpopulationandasuddenaccelerationofthescientificandtechnologicalrevolution.　10)Thewriter'ssolutiontoourecologicalproblemsistoreinventandfinallyheal

7、therelationshipbetweenhumanbeingsandtheearthbycarryingoutacarefulreassessmentofallthe{actorsthatledtotherelativelyrecentdramaticchangeintherelationship.Ⅱ.　1)Itwasnotatallpossibletocatchalargeamountoffish.　2)Followingthelayersoficeinthecoresample,hisfingercameto

8、theplacewherethelayer13oficewasformed2050yearsago.　3)keepsitsenginesrunningforfearthatifhestopsthem,themetalpartswouldbefrozensolidandtheengineswouldnotbeabletostartagain　4)