(作文)GRE作文范例4

1、H0学校：班-13：姓nuB”八号:OddgRe作I文范例4120 X 20Qrofanen virp nmenta magazinThefoliowingisclettertotheeditin dicatestheploba Ipo"Thedeqli neinthe nu mbersofa mp hibia nsworldwidecgariyllutio no fwateran ia/Twostudilesofamphibia nsinY osemiteNationaiParki nCalifornidconatio n*仙叶口 yconc.In 1915'therewe

2、reseVenspec esofa mp hibia nsintheparKa ndmerewereab undan tnumdersofeachs pecies.HoWeverjnXXXXtherewerednlyfourspeciesofa mphibiansobserVedinthepark andthenUmbprsofeachspeciesweredrasticallyreducedhedcline inY ose”iteiasbee nblamed on thei ntroducti on oftrouti ntotheparkichSwaterS'Wheganin 192

3、0住0帕诽 nown tokatam pRibianeggsButthei ntrbductio noftroutcatherealreas IIclinpon fophe* osemitedecii nebjecauseitdoes; notex pi nth|ewor|dw dedecline.Sam pleEssayInthEtterIsargume 门1咻可艇0加61*氓 on cludesthatglobalpolluti on ofwat|erandairhascausedadecline in the numberofa mp hibiansworldWide.Tosu pp c

4、rthis;orherconclus,ion ,thev/ritercitestheresu tsoftWos|tudies,seve nty-fi'eyearsapartihatpurportedlyshowthatthe nu mberofam phiMa n/i none parki nCalifornia'Yosem teNational Parkmavedrastica lydecli nediAdditio nal y,thewritercastsasideagive nreasonforthedecli ne/StOti nglhatthei ntroducto

5、no ftrouttothe parMwhoarek nown toeata mp hibia neggsMoesilote* plainthevorldwidedecji neinthenumberofamphibians.ThisargHmertdefiessiL pkjlogipa ndsuffrsfromseveralcrjticalfallaciesleFirs|ofall,theargumentisbasedo nonlytWostiidies in ones pecific parjoftheworld.YosemijteNati onalParkin Califor ni a.

6、Itisim pcssibleto)inpointaworldwidetheoryforthedeclineofa mp hibiansbasedc nanynu mbemfstudiesino nly on especificlocationlin thewold-thes pecificvarietiesofamphibi* ns,geogra phicalc on citionsa n(ations peCificvaricasamespnsuchasweep nggeneonsp ecificlpcaq oncannodeiforallotherlOcatiO nsevenwithin

7、onep aiticularco un try,letalo nethee ntir|ewohd.Themeorevp no verthlereasofYosem iteNatiaKorthattheexactsames' udyffectsabywhlereelseintheglobalenvironment.1 1 11 1Se*。ndLthejtwosep aratestudiesw'ere(loneseve nty-fiveyearsa partThereisnoeYosemitestudywithanyp urportedeviden c*hatthetWostUdi

8、eswereconduc|tedi nasimilarmanneroverthescmedurawriter卩帧勒noevicen cedwhatsoevertha tl in kstheascswereuded.Forexample, perha psthefirststudylastedovera nertireyear* ndWon ductedbytwenty-fiveexpertWinamp hlbioLsbiollogyiesuitin ginthlefindi ngofseten specvenspedovera penodofo neweekbyalo nehigschools

9、tudertas;ischoolspie nceprojecl.Thewrilerofferspobasiso nwhichtocom parethetwostudies,leavingitope nalstowhetllertqetwoaretrulycomparablei ntheirbreOdtnscoplea ndexpertise.Fi nallyZewriternotesthatthedleclinei ntheainp hibianpop ulatio nhasbee nblamedb nth* in troduct ionoftrout in tothd park'sw

10、atersinO'bitthen dismissesthn tonthep urelyspeciousbasistiatitdoes no tex plai ntheworldwipedecli ne.Tnis paHoftlleaatargumeiesHfam phibia nsinabundan tnumbers.Byco ntrast, perha psthesec on dstudywargume ntblithelydismissestheveryreleva ntf*ctthattrcutarek nown toeatamphibi# neggThisalt5mpjto&q

11、uot; p/ovean egative"istpelastresortdfthosei n*earchofsomevainattamp t?rovethetruthofthematterthattheyalreaSserti ng.ltisbasica “科 posSibleto" pfovea negve" thisisapttcshifttheburdenofproo' backo ntotheno nbelieVersoftheargUelame ntalsitualio nan dthatc YosemiteNatio nated，a ndtie

12、factthattheltroutmayveryWellberes ponsibieforthedecli nscan no t*： mp ybedismissedWithoutfukhe 卩叭；In summary,tiewriterfailstoestablisha nycaqsalreiatio nship betwee ngiobaiairardwaterpollut ionan dthedecli neofam 卩申。uslifeworldwide.Theev denceptremeiyweakatbestand narroWlyfcjcuses onn eti nyalreaoft

13、heglobeaswellas pwardasprooftwoStud esaboutWhichalmost no thin gi* nown .申旧*。门*6计9呻6 nt thewriterwouldneedtoditectiy putfortheviden ceassociati ngaira ndwaterpollutio nwjthnlythedeclineatYosemitebutaisothroughoutotherareasOftheworljd.参考译文11全1球两栖1动物1数量的1减1少明1显标志1着11全球性水与大气的1污染。对加利福尼亚州约1塞米蒂国家公园内两1栖动物所作的两项研究可1证实我的1这结论0 1 i9i5 1年公园1内1有七1个物种1的两栖动物,每-一一物1种都拥有丰富的种群数量1 0然(599words)s.opatiment.tedisexlP arkare notp erfejctlycorr而xRxx年在1公园内所能观察到的两栖1动物物种仅1为四类，1且每1一物种1叫1种群数量已1骤然下降。约塞米蒂1公园动物数量减少被归咎1于始于19201年的将鲑鱼引11入公园水域的做法(1