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阅读理解Noneofourearlyancestorscoulddigestmilkasadultsbecausetheirbodiesneverhadto-milkdrinkingsimplywasn'tanoption.Aspeoplebegantoextractmilkfromanimalsthoughsomepeopledevelopedtheabilitytokeepd
更新时间: 2025-08-29 12:47:51
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Noneofourearlyancestorscoulddigestmilkasadultsbecausetheirbodiesneverhadto-milkdrinkingsimplywasn'tanoption.Aspeoplebegantoextractmilkfromanimalsthoughsomepeopledevelopedthe

abilitytokeepdrinkingitthroughouttheirlives.

Scientistsnowknowofamilkrelatedmutation(变异)inourgenes-thechemicalinstructionsforlifethatwecarryinalmosteverycellinourbodies.Peoplewhohaveamutatedformofoneparticulargenecan

drinkmilkjustfine.Peoplewithoutthemutationtendtogetsickfrommilk.

Tofigureoutwhereandpossiblywhymilkdrinkingstartedsomescientistshavebeenlookingatwho

hasthemilkdigestingmutationtoday.Patternsarestriking.

MostadultsinNorthernandCentralEuropeareabletodigestmilk-andtheydo.Cheesebutterand

otherdairyproductsarepopularincountriessuchasSwedenDenmarkGermanyandEngland.Because

EuropeansettlersdominatedNorthAmericamostpeopleherecanhandlemilkjustfineaswell.Thatmay

explainwhyicecreamissuchapopulardessertintheUnitedStates.

InmuchofAfricaAsiaandSouthAmericaontheotherhandpeopletendtoavoiddairyproducts

becausetheyleadtodiarrhea(腹泻)andotherstomachproblems.(That'swhyyouwon'ttypicallyfind

cheeseonthemenuataChineseJapaneseorEthiopianrestaurant.)NativeAmericansarealsounableto

digestmilk.

BasedonthesegeneticpatternsscientistshavelongthoughtthatmilkdrinkingstartedinNorthern

Europewheredairyisaninstitutionandthemilkdigestingmutationiseverywhere.

Arecentstudypaintedadifferentpicture.WithacomputermodelThomasandcolleagueslookedatthespreadofthemilkdrinkingmutationfarmingandotherrelatedfactors.Workingbackwardthescientists

concludedthatthefirstmilkdrinkerslivedinCentralEuropearoundwhat'snowHungaryabout7500

yearsago.Thepracticedidn'tstartfarthernorthasscientistshadthoughtbefore.

1.Whichofthefollowingistheproperorderofeventsaccordingtothepassage?

a.Theirchildrenwereabletodigestmilkasadults.

b.Theygotsickfromthem

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