Thegoodsarepackedincartonsinterlinedwith________material.

Don'twashthosefossils!

StandardmuseumpracticecanwashawayDNA.

1.Washing,brushingandvarnishingfossils—allstandardconservationtreatmentsusedbymanyfossilhuntersandmuseumcuratorsalike—vastlyreducesthechancesofrecoveringancientDNA.

2.Instead,excavatorsshouldbehandlingatleastsomeoftheirbountywithgloves,andfreezingsamplesastheyarefound,dirtandall,concludesapaperintheProceedingsoftheNationalAcademyofSciencestoday.

3.AlthoughmanypalaeontologistsknowanecdotallythatthisisthebestwaytouptheoddsofextractinggoodDNA,Eva-MariaGeigloftheJacquesMonodInstituteinParis,France,andhercolleagueshavenowshownjusthowimportantconservationpracticescanbe.Thisinformation,theysay,needstobehammeredhomeamongthepeoplewhoareactuallyoutinthefielddiggingupbones.

4.Geiglandhercolleagueslookedat3,200-year-oldfossilbonesbelongingtoasingleindividualofanextinctcattlespecies,calledanaurochs.ThefossilsweredugupatasiteinFranceattwodifferenttimes—eitherin1947,andstoredinamuseumcollection,orin2004,andconservedinsterileconditionsat-20oC.

5.Theteam'sattemptstoextractDNAfromthe1947bonesallfailed.Thenewlyexcavatedfossils,however,allyieldedDNA.

6.Becausetheboneshadbeenburiedforthesameamountoftime,andinthesameconditions,theconservationmethodhadtobetoblamesaysGeigl."AsmuchDNAwasdegradedinthese57yearsasinthe3,200yearsbefore,"shesays.

Washin,washout

7.Becausemanypalaeontologistsbasetheirworkontheshapeoffossilsalone,theirmethodsofconservationarenotdesignedtopreserveDNA,Geiglexplains.

8.Thebiggestproblemishowtheyarecleaned.Fossilsareoftenwashedtogetheron-siteinalargebath,whichcanallowwater—andcontaminantsintheformofcontemporaryDNA—topermeateintotheporousbones."NotonlyistheauthenticDNAgettingwashedout,butcontaminationisgettingwashedin,"saysGeigl.

9.MostancientDNAspecialistsknowthisalready,saysHendrikPoinar,anevolutionarygeneticistatMcMasterUniversityinOntario,Canada.Butthatdoesn'tmeanthatbestpracticehasbecomewidespreadamongthosewhoactuallyfindthefossils.

10.GettingholdoffossilsthathavebeenpreservedwiththeirDNAinmindreliesoncloserelationshipsbetweenlab-basedgeneticistsandtheexcavators,sayspalaeogeneticistSvantePbooftheMaxPlanckInstituteforEvolutionaryAnthropologyinLeipzig,Germany.Andthatonlyoccursinexceptionalcases,hesays.

11.Pbo'steam,whichhasbeensequencingNeanderthalDNA,continuallyfacestheseproblems."WhenyouwanttostudyancienthumanandNeanderthalremains,there'sabigissueofcontaminationwithcontemporaryhumanDNA,"hesays.

12.Thisdoesn'tmeanthatallmuseumspecimensarefatallyflawed,notesPbo.TheNeanderthalfossilsthatwererecentlysequencedinhisownlab,forexample,hadbeenpartofamuseumcollectiontreatedinthetraditionalway.ButPboiskeentoseesamplesoffossilsfromeverymajorfindpreservedinlinewithGeigl'srecommendations—justincase.

Warmandwet

13.Geiglherselfbelievesthat,withcooperationbetweenbenchandfieldresearchers,preservingfossilsproperlycouldopenupavenuesofdiscoverythathavelongbeenassumedclosed.

14.Muchhumanculturaldevelopmenttookplaceintemperateregions.DNAdoesnotsurvivewellinwarmenvironmentsinthefirstplace,andcanvanishwhenfossilsarewashedandtreated.Forthisreason,Geiglsays,mostancientDNAstudieshavebeendoneonpermafrostsamples,suchasthewoollymammoth,oronremainsshelteredfromtheelementsincoldcaves—includingcavebearandNeanderthalfossils.

15.Betterconservationmethods,andafocusonfreshfossils,couldboostDNAextractionfrommoredelicatespecimens,saysGeigl.Andthatcouldshedmorelightonthestoryofhumanevolution.

(640wordsnature)

Glossary

Palaeontologists古生物学家

Aurochs欧洲野牛

Neanderthal(人类学)尼安德特人，旧石器时代的古人类。

Permafrost(地理)永冻层

Questions1-6

AnswerthefollowingquestionsbyusingNOMORETHANTHREEWORDSforeachanswer.

1.Howdidpeopletraditionallytreatfossils?

2.WhatsuggestionsdoGeiglandhercolleaguesgiveonwhatshouldbedonewhenfossilsarefound?

3.Whatproblemsmaybeposediffossilbonesarewashedon-site?NameONE.

4.WhatcharacteristicdofossilboneshavetomakethemsusceptibletobecontaminatedwithcontemporaryDNAwhentheyarewashed?

5.Whatcouldbebetterunderstoodwhenconservationtreatmentsareimproved?

6.Thepassagementionedseveralanimalspeciesstudiedbyresearchers.Howmanyofthemarementioned?

Questions7-11

Dothefollowingstatementsagreewiththeinformationgiveninthepassage?PleasewriteTRUEifthestatementagreeswiththewriterFALSEifthestatementdoesnotagreewiththewriterNOTGIVENifthereisnoinformationaboutthisinthepassage.

7.IntheirpaperpublishedintheProceedingsoftheNationalAcademyofSciences，GeiglandhercolleagueshaveshownwhatconservationpracticesshouldbefollowedtopreserveancientDNA.

8.ThefossilbonesthatGeiglandhercolleaguesstudiedareallfromthesameaurochs.

9.Geneticistsdon'thavetoworkonsite.

10.OnlynewlyexcavatedfossilbonesusingnewconservationmethodssuggestedbyGeiglandhercolleaguescontainancientDNA.

11.Paaboisstillworriedaboutthepotentialproblemscausedbytreatmentsoffossilsintraditionalway.

Questions12-13

CompletethefollowingthestatementsbychoosingletterA-Dforeachanswer.

12.“Thisinformation”inparagraph3indicates:

[A]ItiscriticaltofollowproperpracticesinpreservingancientDNA.

[B]ThebestwayofgettinggoodDNAistohandlefossilswithgloves.

[C]Fossilhuntersshouldwearhome-madehammerswhilediggingupbones.

[D]Manypalaeontologistsknowhowoneshoulddointreatingfossils.

13.ThestudyconductedbyGeiglandhercolleaguessuggests:

[A]thefactthatancientDNAcannotberecoveredfromfossilbonesexcavatedinthepast.

[B]thecorrelationbetweentheamountofburyingtimeandthatoftherecoveredDNA.

[C]thepaceatwhichDNAdegrades.

[D]thecorrelationbetweenconservationpracticesanddegradationofDNA.

Theypromised____eachotherwhentheywenttowork.

TheImportanceofGoodCommunications

Effectivecommunicationisessentialforallorganizations.Itlinkstheactivitiesofthevariouspartsoftheorganizationandensuresthateveryoneisworkingtowardsacommongoal.Itisalsoextremelyimportantformotivatingemployees.Staffneedtoknowhowtheyaregettingon,whattheyaredoingrightandinwhichareastheycouldimprove.Workingalonecanbeextremelydifficultanditismucheasierifsomeonetakesaninterestandprovidessupport.Employeesneedtounderstandwhytheirjobisimportantandhowitcontributestotheoverallsuccessofthefirm.Personalcommunicationshouldalsoincludetargetsetting.Peopleusuallyrespondwelltogoals,providedtheseareagreedbetweenthemanagerandsubordinateandnotimposed.

However,firmsoftenhavecommunicationproblemsthatcanunderminetheirperformance.Inmanycases,theseproblemsoccurbecausemessagesarepassedoninaninappropriateway.Thereare,ofcourse,severalwaysofconveyinginformationtoothersintheorganizationwhichincludespeakingtothemdirectly,e-mailing,telephoningorsendingamemo.Themostappropriatemethoddependsonwhatexactlyitisyouarecommunicating.Forexample,anythingthatisparticularlysensitiveorconfidential,suchasanemployee'sappraisal,shouldbedoneface-to-face.

Oneofthemainproblemsforseniorexecutivesisthattheydonothavethetimeorresourcesneededtocommunicateeffectively.Inlargecompanies,forexample,itisimpossibleforseniormanagerstomeetanddiscussprogresswitheachemployeeindividually.Obviouslythistaskcanbedelegatedbutatthecostofcreatingagapbetweenseniormanagementandstaff.Asaresult,managersareoftenforcedtouseothermethodsofcommunication,likememosornotes,eveniftheyknowthesearenotnecessarilythemostsuitablemeansofpassingonmessages.

Theuseoftechnology,suchase-mail,mobilephonesandnetworksystems,isspeedingupcommunicationimmensely.However,thisdoesnotmeanthatmoreinvestmentintechnologyautomaticallyprovesbeneficial:systemscanbecomeoutdatedoremployeesmaylackappropriatetraining.Therearemanycommunicationstoolsnowavailablebutafirmcannotaffordallofthem.Evenifitcould,itdoesnotactuallyneedthemall.Thepotentialgainsmustbeweighedupagainstthecosts,andfirmsshouldrealizethatmorecommunicationdoesnotnecessarilymeanbettercommunication."

Asthenumberofpeopleinvolvedinanorganizationincrease,theuseofwrittencommunicationrisesevenfaster.Insteadofaquickconversationtosortsomethingoutnumerousmessagescanbepassedbackwardsandforwards.Thiscanleadtoatremendousamountofpaperworkandisoftenlesseffectivethanface-to-facecommunication.Whenyouareactuallytalkingtosomeoneyoucandiscussthingsuntilyouarehappythattheyhaveunderstoodandfeedbackisimmediate.Withwrittenmessages,however,youareneverquitesurehowitwillbereceivedwhatyouthinkyouhavesaidandwhattheotherpersonthinksyouhavesaidcanbeverydifferent.

Theamountofwritteninformationgeneratedinlargeorganizationstodaycanleadtocommunicationoverload.Somuchinformationisgatheredthatitgetsinthewayofmakingdecisions.Takealookattheaveragemanager'sdeskandyouwillseetheproblem--itisoftencoveredwithletters,reportsandmemos.Thisoverloadcanleadtoinefficiencies.Forexample,managersmaynotbeabletofindtheinformationtheywantwhentheyneedit.Communicationisalsobecomingmoredifficultwiththechangesoccurringinemploymentpatterns.Withmorepeopleworkingpart-timeandworkingathome,managingcommunicationisbecomingincreasinglycomplex.

1.InthefirstparagraphthewriterrecommendsthatcommunicationwithstaffshouldincludeA.somefeedbackontheirjobperformance.

B.anexplanationofhowcompanytargetshavebeenset.

C.informationonpromotionprospectswithinthecompany.

D.anindicationofwhichdutiestheycanexpectassistancewith.areastheycouldimprove

2.Accordingtothewriter,thebestwayofachievingeffectivecommunicationistoA.adaptthemessagetosuitaparticularaudience.

B.makethecontentofmessagesbriefanddirect.

C.selectthemostsuitablemeansofconveyingaparticularmessage.

D.ensurethatinformationistargetedattheappropriategroupofpeople.

3.Whatdoesthewritersayaboutthecommunicationoptionsavailabletoseniormanagers?A.Sendingmemostostaffisoneofthemostefficientmethods.

B.Itisimportanttofindthetimetodiscusscertainmatterswithstaff.

C.Theyshouldincreasetherangeofoptionsthattheyuse.

D.Gettingjuniormanagerstotalktostaffcancreatedifferentproblems.

4.Whatadviceisgivenaboutthecommunicationtoolsmadeavailablebytechnology?A.Aimtolimitstaffuseofcertaincommunicationtools.

B.Evaluatethemintermsoftheexpenditureinvolved.

C.Selectthemonthebasisofthefacilitiestheyoffer.

D.Encouragemorestafftoattendtrainingcoursesintheiruse.

5.Accordingtothewriter,aproblemwithwrittencommunicationisthatA.themessagecanbeinterpreteddifferentlytowhatwasintended.

B.itcanbeeasyforpeopletoignorethecontentsofawrittenmessage.

C.mostpeoplearemorecomfortablewithface-to-facecommunication.

D.itispossibleforcorrespondencetogetlostwithinalargeorganization.

6.Accordingtothearticle,whatistheeffectofreceivinglargeamountsofwritteninformation?A.Itiscounter-productive."

B.Itcausesconflictinacompany.

C.Itleadstochangesinworkpatterns.

D.Itmakesthemainpointsmoredifficulttoidentify.

Highbloodpressure