2023屆高三英語培優(yōu)外刊閱讀學(xué)案牛奶話題

高三英語培優(yōu)外刊閱讀班級：學(xué)號：姓名：外刊精選I人高馬大的歐洲人：乳糖不耐也要喝牛奶上個(gè)月，新疆牛奶品牌麥趣爾產(chǎn)品抽檢不合格，再次引發(fā)了關(guān)于如何選好牛奶的網(wǎng)絡(luò)熱議。實(shí)際上，很多中國人其實(shí)根本不適合喝牛奶，因?yàn)橹袊巳樘遣荒褪艿谋壤h(yuǎn)高于歐美人。而國外的一項(xiàng)新研究發(fā)現(xiàn)，原來我們印象中離不開牛奶的歐洲人，很多也是乳糖不耐受的體質(zhì)。究竟為什么會有人乳糖不耐受？科學(xué)家還有哪些新發(fā)現(xiàn)？EarlyEuropeansCouldNotTolerateMilkbutDrankItAnyway,StudyFindsInmanyways,humansareweirdmammals.Andourrelationshipwithmilkisespeciallyweird.Ineverymammalianspecies,femalesproducemilktofeedtheiryoung.Thebabiesdigestthemilkwiththehelpofanenzymecalledlactase.Whentheyoungmammalsareweaned,theystopmakinglactase.Butitiscommonforourspeciestokeepconsumingmilkintoadulthood.What'smore,aboutone-thirdofpeoplecarrygeneticmutationsthatallowthemtoproducelactasethroughouttheirlives,makingiteasiertodigestmilk.Scientistshavelongsuspectedthatdairyconsumptionandthepersistenceoflactaserosetogetherinhumanhistory.Whenpeoplestartedherdingcattleandotherlivestocksome10,000yearsago,thetheorywent,thosewithamutationforlactasepersistencegainedanewsourceofcaloriesandprotein.Butanewstudysuggeststhatthetraditionalstorydoesnotholdup.ResearchershavefoundthatEuropeanswereconsumingmilkwithoutlactaseforthousandsofyears,despitethemiseryfromgasandcrampingitmighthavecaused.Overtheyears,scientistshavefoundmilkonthousandsofpotteryfragmentsacrossEuropeandneighboringregions.Forthenewstudy,thescientistsusedthisdatabasetocreateamapofmilkconsumptionoverthepast9,000years.【詞匯過關(guān)】請寫出下面文單詞在文章中的中文意思。.tolerate['toIreit]v..weird[wiod]adj..consume[ksn'sju：m]v..cramp[kr<emp]v./n..fragment['frsegmsnt]n.【詞塊學(xué)習(xí)】請從文章中找到下面中文相對應(yīng)的文詞塊。.借助于，利用.使做某事更容易.長期懷疑.理論是這樣的.（這個(gè)故事沒有）站得住腳拓展練習(xí)閱讀理解Modemmedicine'sabilitytokeepusalivemakesittemptingtothinkhumanevolutionmayhavestopped.ButifwelookattherateofourDNA'sevolution,wecanseethathumanevolutionhasn'tstopped一itmayevenbehappeningfasterthanbefore.EvolutionisagradualchangetotheDNAofaspeciesovermanygenerations.Itcanoccurbynaturalselection,whencertaintraitscreatedbygeneticchangeshelpanorganismsurviveorreproduce.Suchgenesarethusmorelikelytobepassedontothenextgeneration,sotheyincreaseinfrequencyinapopulation.Gradually,thesechangesandtheirassociatedtraitsbecomemorecommonamongthewholegroup.BylookingatglobalstudiesofourDNA,wecanseeevidencethatnaturalselectionhasrecentlymadechangesandcontinuestodoso.Thoughmodernhealthcaredisruptsakeydrivingforceofevolutionbykeepingsomepeoplealivelonger,incountrieswithoutaccesstogoodhealthcare,populationsarecontinuingtoevolve.Survivorsofinfectiousdiseaseoutbreaksdrivenaturalselectionbygivingtheirgeneticresistancetooffspring.OurDNAshowsevidenceforrecentselectionforresistanceofkillerdiseaseslikeLassafeverandmalaria.Selectioninresponsetomalariaremainsinregionswherethediseaseremainscommon.Humansarealsoadaptingtotheirenvironment.GenechangeallowinghumanstoliveathighaltitudeshavebecomemorecommoninpopulationsinTibet,Ethiopia,andtheAndes.ThespreadofgeneticchangesinTibetispossiblythefastestevolutionarychangeinhumans,occurringoverthepast3,000years.Thisrapidincreaseinfrequencyofamutatedgenethatincreasesbloodoxygencontentgiveslocalsasurvivaladvantageinhigheraltitudes,resultinginmoresurvivingchildren.Dietisanothersourceforadaptations.Studiesshowthatnaturalselectionfavoringachangeallowingadultstoproducelactase-theenzyme(酶)thatbreaksdownmilksugars-iswhysomegroupsofpeoplecandigestmilk.Over80percentofnorthwestEuropeanscan,butinpartsofEastAsia,wheremilkismuchlesscommonlydrunk,aninabilitytodigestlactoseisthenorm.Likehighaltitudeadaptation,selectiontodigestmilkhasevolvedmorethanonceinhumansandmaybethestrongestkindofrecentselection.Yet,despitethesechanges,naturalselectiononlyaffectsabout8percentofourgenome.Butscientistscan'texplainwhysomegenesareevolvingmuchfasterthanothers.WemeasurethespeedofgeneevolutionbycomparinghumanDNAwiththatofotherspecies.Onefast-evolvinggeneishumanacceleratedregion1(HARI),whichisneededduringbraindevelopment.ArandomsectionofhumanDNAisonaveragemorethan98percentidenticaltothechimpcomparator,butHARIissofastevolvingthatit'sonlyaround85percentsimilar.Thoughscientistscanseethesechangesarehappening-andhowquickly-westilldon'tfullyunderstandwhyfastevolutionhappenstosomegenesbutnotothers..Whichofthefollowingstatementsmaytheauthoragreewith?A.Evolutionoccursamongseveralpeopleovernight.B.Genesmaychangeandsomearebeneficialtopeople'slives.C.Evolutionisdonewhenthewholepopulationpossessesacertaingene.D.Thechangedgenesleadingtohighersurvivalratesarechosendeliberately..Theunderlinedword“disrupts”.Theauthorillustrateshumans'ongoingevolutionwiththefollowingexamplesEXCEPTthat.A.somepeoplecanresistinfectiousdiseaseslikemalariaB.childreninTibettoleratelivingenvironmentswiththinairC.northwesternEuropeansdigestlactosebetterthanEastAsiansD.thehumangeneHARIresemblesthatofachimptoalesserextent.Whichofthefollowingmayserveasthetitle?A.WhatIsNaturalSelection?B.AreHumansStillEvolving?C.WhyWillCertainGenesEvolve?D.HowDoMutatedGenesFunction?外刊精選答案【詞匯過關(guān)】請寫出下面文單詞在文章中的中文意思。.tolerate['tDIreit]v.容許,允許;忍受;容忍.weird[wlsd]adj.奇怪的;詭異的;怪誕的.consume[kon'sju：m]v.消費(fèi);吃;消耗，耗費(fèi)4,cramp[kraemp]v./n.抽筋;痛性痙攣;（腹部）絞痛.fragment['frasgmont]n.碎片;片段【詞塊學(xué)習(xí)】請從文章中找到下面中文相對應(yīng)的文詞塊。l