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1、Zoosaresometimesseenasnecessarybutpooralternativetoanaturalenvironment.Isitnecessarytokeepanimalsinzoos?动物园的必要性：1.Zoosarecrucialforprotectingcertainrarespeciesfromextinction.2.zoosalsoassistresearchfacilitiestocarryoutharmlessscientificresearchonanimals’livingpatterns.1.zooscankeepanima
2、lsawayfrombarbaricharmandhunting.2.childrenwilllearnhowtoprotectanimalsthroughobservingthemandthiswillalsoaddtotheirknowledgethattheywillneveracquireinclassroom.动物园的弊端：1.somepeoplethinkitiswasteofmoney.1.itviolatestherightsofanimals2.itbreakstheecologicalbalance3.itmayresultinenvironmen
3、talpollutionSample:Inthemodernsociety,zoosarealmostindispensableplacesinlargecitiesforpeopletovisit.Insomelargezoos,therearevariousanimalsfromspacetosea,andfromprimitiveinvertebratestoadvancedandintelligentmammals.Inthezoos,allanimals,includingthoserareanimals,suchaspanda,Africaelephant
4、,andNorth-Easttiger,couldenjoygoodcareandprotectionawayfromanyhurt.However,alongwiththestrongernaturalenvironmentalprotectionconsciousness,manypeoplethinkthattoputanimalsintosmallcageswillchangetheirlivinginstincts,andthereforebreaktheecologicalbalance.Viewedfromthebasicrelationbetweena
5、nimalsandhumanbeings,animalsshouldhavetheequalfreedomashumanbeings.Theyareallformsoflife.Animalshavetheirownlivinginstinct,anditisthisinstinctthatformsthebiologicalchainoftheearth.Thisrelationiscalledecologicalbalanceacademically.Forexample,insect-bird-snake.Ifmostbirdsinaregionarekille
6、dandlockedintocagesbyhumanebeings,thepestswilleatoutallcrops,andthesnakeswilllosealargepartoffood-resources(birds),thereforeleadingtothestarvationanddeath.Thisopinionsoundsidealtheoretically.Howeverinreality,humanbeingsandotheranimalscannotstaytogetherpeacefullyontheEarth.Becauseofhuman
7、beings’lustforfortune,manyvaluableanimalsarekilledorsold,especiallythoseendangeredspecies.Therefore,zoosappearasanactivewayforpeopletoprotectthosepooranimals.First,thisisanactionnotonlyforanimalsbutalsoforhumanbeingitself.Oncethebiologicalchainisbroken,humanbeingswillbepunished
