step_by_step3000第三册unit2答案及原文

《step_by_step3000第三册unit2答案及原文》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Unit2EarthandEnvironmentPart1WarmingupA1....impactofclimatechange…damagetocrops…worse...2....2000delegates…northernBrazil…thirdUnitedNationsConferenceonDesertification.3....Ahugeoilspill…Mexico,...4.Wildfires…Florida…contained…aweek...5....Greenlandismeltingaroundtheedges…50cubickil

2、ometers…raiseglobalsealevel...B1.Itattemptstobalanceenvironmentalconcernsandtheneedsofthecommunity.2.Reptilespeciesareingreatertroublethanamphibianspecies.3.Anewapproachinthefightagainsttheillegaldrugstrade.4.Oneineveryeightspeciesofplantsisthreatenedwithextinction.5.Anewlocaldirect

3、oryfortheenvironmentally-aware,calledthe“BoulderCountyGreenPages”.Tapescripts:1.Australiaistheworld’sdriestcontinent.There’sgeneralagreementthatthecountryhastousewatermoreefficiently.Inmanypartsuppliesareincrisis.AtameetinginCanberra,theCouncilofAustralianGovernmentshasapprovednatio

4、nalwaterplan.Itattemptstobalanceenvironmentalconcernsandtheneedsofthecommunity.Theamountofwatertakenfromriversforcommercialuseistobecutandfarmerswillbecompensated.1.Thedisappearanceanddeformityofamphibianssuchasfrogsandsalamandersfromrainforestsandmountainlakesworldwidehasattractedw

5、ide-spreadscientificattentionoverthelastdecade.Nowanewstudysaysreptilespeciesincludingturtles,snakes,andalligatorsareinevengreatertrouble.Twiceasmanyreptilesasamphibians,orsome100species,arecurrentlylistedasendangeredbytheWorldConservationUnion.Thestudysayshabitatlossanddegradation,

6、pollution,disease,climatechange,andover-collectionforfood,petsanddrugsarethemajorthreattoreptiles.2.FourregionalgovernorsfromColumbia,onavisittoWashington,havesharplycriticizedanAmerican-backedaerialoffensivetoeradicatethousandsofhectaresofillegalcokeandpoppyplantations.Atanewsconfe

7、rencethegovernorscalledforadifferentapproachinthefightagainsttheillegaldrugstrade,sayingthattheherbicidescurrentlybeingusedwereharmfultopublichealthandtheenvironment.3.Muchattentionhasbeendevotedtothethreatenedanimalspecies.Butwhataboutplantswhicharethefundamentalbasesoflife?Oneinev

8、eryeightspeciesofpl