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1、ships of desert -exposition1expositionExpositionisexplanatorywriting.ItspurposeistoexplainorclarifyapointPatternsofexposition:exemplification;processanalysis;causeeffectanalysis;comparisonandcontrast;classification;analogy;definition.2OrganizationPart 1 (para. 1-8): the list of the images of environ
2、mental 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
3、 solution to environmental destructions- reinventing and healing the relationship between civilization and the earth3Lossofbiodiversity4Biodiversity（生物多样性）Definition：Biologicaldiversity(biodiversity)referstoarangeofdiverselivingorganisms(animals,plants,micro-organisms)onaregularbasisconstitutedbythe
4、combinationofstableecologicalcomplexes.5Valueofbiodiversityanditssignificance：Directvalue：（1）biodiversityprovidesfood,fiber,buildingmaterialsandfurniture,andotherindustrialrawmaterialsforhumanbeings.6（2）Biodiversityalsohaveaestheticvalue（美学价值）,wecancultivateoursentimentsandbeautifypeopleslives.Inadd
5、ition,biodiversitycanalsostimulateinspirationforliteraryandartisticcreation.wintersweet7chrysanthemum8bamboo9（3）Biodiversityhasanimportantecologicalfunction.Nomatterwhatkindofecosystem,wildlifeisoneoftheessentialcomponents.Wildlifeoncereduced,theecosystemstabilitywouldbedestroyed,thesurvivalenvironm
6、entofmankindwouldalsobeaffected.10thepotentialvalue:asfarasthemedicinalproperties,80%ofthepopulationsindevelopingcountriesrelyonplantsoranimals,toensurethebasichealth.111213Causesofbiodiversityreduction:1、Therapidincreaseinpopulation.14Thepopulationkeepsincreasing,soarablelandmustbeexpandedtomeetdemandsofeating,thisbecomesthedirectthreattothenaturaleco-systems.152、Overexploitation16Environmentalpollution17killing1819No!20Are these problems difficult to be solved?21As long as we can start out small.22232425
