生物多样性英文省公共课一等奖全国赛课获奖课件.pptx

ships of desert -exposition第1页expositionExpositionisexplanatorywriting.ItspurposeistoexplainorclarifyapointPatternsofexposition:exemplification;processanalysis;causeeffectanalysis;comparisonandcontrast;classification;analogy;definition.第2页OrganizationPart 1(para.1-8):the list of the images of environmental destruction:the drying up of the Aral;deforestation;air pollutionPart 2(para.9-16):analysis of the global threats posed by the environmental destruction and the common cause-the change in the relationship between human civilization and the earths natural balancePart 3(para.17-26):the solution to environmental destructions-reinventing and healing the relationship between civilization and the earth第3页Lossofbiodiversity第4页Biodiversity（生物多样性）Definition：Biologicaldiversity(biodiversity)referstoarangeofdiverselivingorganisms(animals,plants,micro-organisms)onaregularbasisconstitutedbythecombinationofstableecologicalcomplexes.第5页Valueofbiodiversityanditssignificance：Directvalue：（1）biodiversityprovidesfood,fiber,buildingmaterialsandfurniture,andotherindustrialrawmaterialsforhumanbeings.第6页（2）Biodiversityalsohaveaestheticvalue（美学价值）,wecancultivateoursentimentsandbeautifypeopleslives.Inaddition,biodiversitycanalsostimulateinspirationforliteraryandartisticcreation.wintersweet第7页chrysanthemum第8页bamboo第9页（3）Biodiversityhasanimportantecologicalfunction.Nomatterwhatkindofecosystem,wildlifeisoneoftheessentialcomponents.Wildlifeoncereduced,theecosystemstabilitywouldbedestroyed,thesurvivalenvironmentofmankindwouldalsobeaffected.第10页thepotentialvalue:asfarasthemedicinalproperties,80%ofthepopulationsindevelopingcountriesrelyonplantsoranimals,toensurethebasichealth.第11页第12页第13页Causesofbiodiversityreduction:1、Therapidincreaseinpopulation.第14页Thepopulationkeepsincreasing,soarablelandmustbeexpandedtomeetdemandsofeating,thisbecomesthedirectthreattothenaturaleco-systems.第15页2、Overexploitation第16页Environmentalpollution第17页killing第18页第19页No!第20页Are these problems difficult to be solved?第21页As long as we can start out small.第22页第23页第24页第25页