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DForthousandsofyears,theTaklamakan Desertpreservedmore than thebodiesfthoseburiedChina'sTarimBasinArchaeologistspunojpebble-sizedpiecesyellowishsubstance:theworld'soldestcheesescatteringaroundnecksof somebodiesXiaohe,aBronze AgecemeteryArecetstudyublishedCell,nalyzesheDNA of thiscientdairy,sheddingwitwasmadeandproductionspread.Inapreviousstudyresearchers tooktinysamplesoffthe3,500-year-lcheeseattachedtothemummies'necks.AnnalysisoroteinsthoseunveiledthepresencefLactobacilluskefiranofaciens,amicrobe（发酵菌usedto producecheeselledkefir."That was really amazing",saysQiaomei Fu,scientisChineseAcademyof Sciences inBeijingHavingworkedwithancienthumanDNA,wantedtoshstudthemicrobe's DNAHowevextractingcompleteDNAfromsuch ancientsamplesprovedchanallengings itbrokedownover time and mixedwith geneticinformation fromenvironment.In201Fu begandesigningspecialmolecules（分thacould efficientlycapturethemicrobe's ancientDNAfrom thecheese.Afteryears ofworkand hermmanaged toreconstruct 92percent oftheancientnicrobeSDNAFrom thisnicrobeDNA,theteam couldexplorethe historyof thecheese'sproduction.Kefir ismadebymixingmilkithan existingmicrobe,and as it spreadso didmicrobesused tomakeit.omparingtheDNAfromthXiaohecheesewiththatofothers,twobranchesemerged:from EudthePacificIslandsdtheTibetand EastoneopeAsiavhichsuggestspossiblerouteforkefir'sspreadfromXinjiangEastAsia,possiblythroughmigrationTheDNAanalysisalsopointed to theinteractionof ancientpeoples.uncovered thatsamplesfrom cows andgoatswerefound.Interestingly,thegoatDNAresembledthat ofotherancientgoats,suggestingmixingXinjiangwiththeBronzeAgepulations,Researcheranticipatethatfurthernalysimicrobesalongwithotherbiologicalsamplescouldprovidedeeper insightsinteractions betweerancientpopulations,32.What'sthesignificance of the DNA analysisof the ancient cheese?A.Itreflectthecivilization of theBronze Age.B.It provesChinaobethe first toproducedairyproducts.C.It uncoversthesteriousburied bodies inXiaohe cemeteryD.Itrevealsproductiomethodssand transmission routes of thecheese.33.Whatobstacledid Fu's teamencounter inn their study?A.The completeofDNAwas hardtobtain.B.The team lackedworkingexperienceithDNA.C.Thepreviousstudyprovedabsencea microbeD.Thecheesesampleswere resistant to DNA extractionmethods宁波市2024学年第学期高考与选考模拟考试英语试卷第6页共10页