---来源搜集,文内均可编辑---来源搜集,文内均可编辑PAGE3---来源搜集,文内均可编辑保护野生动物Manywildanimalsarefacingthedangerofextinction,becausetheenvironmentthattheyarelivinginhaschangedgreatly.Forexample,withthedevelopmetofcities,theusingofinsecticideandseriouspollution,theirlivingareashavebecomenarrowcrandnarrower.Manyofthewildanimals,nowareconfrontedwithfoodcrisis.Atthesametime,maniskillingoffspeciesjustforgettingtheirfur,skin,horns,teethandmeat.Inordertoprotectourresourcesofecology,peopleshouldrealizethatthelossofanyspeciesisatleastthelossofsourceofknowledgeandasourceofnaturalbeauty.Therefore,measuresofthefollowingshouldbetaken:pollutionstandardsaremadetokeepdownpoisons;killingoffcertainrarespeciesisprohibited;nationalparksshouldbesetupaswildlife,reserves.Onlyifwehumanbeingstakesomedrasticmeasurescanwildanimalsbepreserved.许多野生动物正面临绝种的危险,因为它们生活的环境发生了极大的变化。譬如,随着城市的发展,杀虫剂的使用和严重的污染,野生动物的生活区域变得越来越狭小。许多野生动物目前正面临着食物方面的危机。同时,为了获取野生动物的毛、皮、角、牙齿和肉,人类正在屠杀野生动物。为了保护生态资源,人们应当意识到任何物种的缺失,至少意味着知识资源和自然美的缺失。因此,应采取以下措施:制订污染
标准
excel标准偏差excel标准偏差函数exl标准差函数国标检验抽样标准表免费下载红头文件格式标准下载
以降低有毒物质;严禁杀害某些稀有物种;应建立国家公园作为野生动植物保护区。熊猫Pandaisoneofthescarcestanimals.Peopleintheworldlikeitverymuch.ThereusedtobemanypandasinChinalongago.Asthebalanceofnaturewasdestroyedandtheweatherwasgettingwarmerandwarmer,pandasbecameless.Butatpresent,thenumberofpandasisincreasingyearbyyear.Therearenowsomanypandasthatsomearebeingsenttoothercountriessothatpeopletherecanenjoythem.Nowadays,thebiggestnatureparkforpandainChinaisinSichuan.Thereisaresearchcentrefornatureandwildlifethere.Scientistshopethatonedaytheywillhaveenoughpandastobesetfreeandletthemliveinthewildagain.兔子AreyouthinkingofkeepingapetrabbitMaybeyoualreadyhaveone.Eitherwayyouareoneofthemillionsofpetloverswhothinkofrabbitsasidealpets.Thisisnotsurprisingastheyareendearing,affectionateanimalsthateasilyswayuswiththeircharm.Iraisealotofhouserabbitsaspets.Youdon'tknowhowlovelytheyareuntilyouraisethemindeedandwhatanignorantloveryouarewhenyouwanttomakefriendswiththem.Fortunately,thosewhitebunniestoldmenotonlyhowcharmingtheyare,butalsowhotheyare.Theytoldmethatrabbitsareactive.Theyneedplentyofspace,aspaciousrunoutdoorsorfreedomtorunaroundthehouseforseveralhourseveryday.Cagesshouldbeburrowstorestin,notprisons!Theytoldmethatrabbitsaresociable.Yourpetwillneedplentyofcompanyeitherfromyou,abunnycompanionorpreferablyboth.Theytoldmethattheyareweak.Preyeduponbypredators,rabbitsarenaturallyshy,quietanimalswhohatebeingheldabovegroundlevel.Gainingthetrustofarabbittakestimeandeffort.Keepingarabbitaloneinahutchdoesn'tmeetmanyofthefundamentalneedsofthespeciesandresultsinaboredanddistressedpet.Asacaringowneryou'llneedtolookatalternatives.Remember,gardensandrunsneedtobesecureagainstcatsanddogs.Rabbitsareverycleananimalsandcanbetrainedtousealittertray.Onerabbitwilllivehappilyinthehousewithplentyofhumancompany.Tworabbitswillbeverycontentifyouleadabusylifestylewithlesstimetodevotetothem.Mostofmyrabbitsruntogreettheirownerswhentheycomeinfromwork!However,houserabbitsarenotsuitablepetsforeveryone.Justlikecatsanddogs,theycanbedemandinganddestructive,especiallyasyoungsters.Somewearandtearonthefurnishingsaswellasabitofmessisinevitable.Theaveragelifespanofarabbitis7-10years.Rabbitscanmakegoodfamilypetsifparentsrespecttheneedsoftherabbitandthelimitationsofthechildren.Adultsneedtoacceptalltheresponsibilityofcaringfortherabbit.Pleasedonotbuyarabbitsolelyasachild'spet.Theydonotliketobepickedupandcaneasilyinjuretheirbacksiftheyfalloraredropped.Childrenmaynothavethepatiencenecessarytoestablisharelationshipwitharabbit.Rabbitsareraisedworld-wideforavarietyofreasons.Theyareanimportantsourceoffood.Rabbitsproducewhitemeatthatisfine-grained,highinprotein,lowinfat,highlypalatable,lowincholesterol,andthatcanbesubstitutedforpoultryinmostrecipes.Highqualityrabbitskinsareusedinfurgarmentsandtrimmings.Medicalandcosmeticresearchalsorequiresalargenumberofrabbitseachyear.ButtheonlyreasonthatIraiserabbitsisthat,theyarelovelypetsaswellasweakestkids.Icouldseeapureworldthroughtheircystaleyes.Theymakemeforgettemporarilytheevilsanduglinessinlife.