生物多樣性英文

shipsofdesert

--exposition

第一頁，共二十五頁。expositionExpositionisexplanatorywriting.ItspurposeistoexplainorclarifyapointPatternsofexposition:exemplification;processanalysis;causeeffectanalysis;comparisonandcontrast;classification;analogy;definition.

第二頁，共二十五頁。OrganizationPart1(para.1-8):thelistoftheimagesofenvironmentaldestruction:thedryingupoftheAral;deforestation;airpollutionPart2(para.9-16):analysisoftheglobalthreatsposedbytheenvironmentaldestructionandthecommoncause---thechangeintherelationshipbetweenhumancivilizationandtheearth’snaturalbalancePart3(para.17-26):thesolutiontoenvironmentaldestructions---reinventingandhealingtherelationshipbetweencivilizationandtheearth第三頁，共二十五頁。Lossofbiodiversity第四頁，共二十五頁。Biodiversity（生物多樣性）Definition：Biologicaldiversity(biodiversity)referstoarangeofdiverselivingorganisms(animals,plants,micro-organisms)onaregularbasisconstitutedbythecombinationofstableecologicalcomplexes.第五頁，共二十五頁。Valueofbiodiversityanditssignificance：Directvalue：（1）biodiversityprovidesfood,fiber,buildingmaterialsandfurniture,andotherindustrialrawmaterialsforhumanbeings.第六頁，共二十五頁。（2）Biodiversityalsohaveaestheticvalue（美學(xué)價(jià)值）,wecancultivateoursentimentsandbeautifypeople’slives.Inaddition,biodiversitycanalsostimulateinspirationforliteraryandartisticcreation.wintersweet

第七頁，共二十五頁。chrysanthemum第八頁，共二十五頁。bamboo第九頁，共二十五頁。（3）Biodiversityhasanimportantecologicalfunction.Nomatterwhatkindofecosystem,wildlifeisoneoftheessentialcomponents.Wildlifeoncereduced,theecosystemstabilitywouldbedestroyed,thesurvivalenvironmentofmankindwouldalsobeaffected.第十頁，共二十五頁。thepotentialvalue:

asfarasthemedicinalproperties,80%ofthepopulationsindevelopingcountriesrelyonplantsoranimals,toensurethebasichealth.第十一頁，共二十五頁。第十二頁，共二十五頁。第十三頁，共二十五頁。Causesofbiodiversityreduction:1、Therapidincreaseinpopulation.第十四頁，共二十五頁。Thepopulationkeepsincreasing,soarablelandmustbeexpandedtomeetdemandsofeating,thisbecomesthedirectthreattothenaturaleco-systems.第十五頁，共二十五頁。2、Overexploitation

第十六頁，共二十五頁。Environmentalpollution

第十七頁，共二十五頁。killing第十八頁，共二十五頁。第十九頁，共二十五頁。No!!!第二十頁，共二十五頁。Aretheseproblemsdiffic