2016職稱(chēng)英語(yǔ)-精講衛(wèi)生閱讀理解第

主講人：

Eatto(選自衛(wèi)生C閱讀理解Eatto1.Ameagerdietmaygiveyouhealthandlonglife,butit’snotmuchfun—anditmightnotevenbenecessary.Wemaybeabletohangontomostofthatyouthfulvigorevenifwedon’tstarttodietuntiloldage.

Accordingtothepassage,whichofthefollowingisNOTEatinglessthanusualmightmakeuslivelonger.Ifwegoonadietwhenold,wemaykeephealthy.Dietingmightnotbe Wehavetobegindietingsincechildhood.EattoStephenSpindlerandhiscolleaguesfromtheUniversityofCaliforniaatRiversidehavefoundthatsomeofanelderlymouse’slivergenescanbemadetobehaveastheydidwhenthemousewasyoungsimplybylimitingitsfoodforfourweeks.Thegeneticrejuvenationwon’treverseotherdamagecausedbytimeforthemouse,butcouldhelpitslivermetabolizedrugsorgetridoftoxins.

WhydoestheauthormentionanelderlymouseinparagraphB)Toillustratetheeffectofmeagerfoodonmice.EattoSpindler’steamfedthreemiceanormaldietfortheirwholelives,andfedanotherthreeonhalf-rations.Threemoremicewereswitchedfromthenormaldiettohalf-feedforamonthwhentheywere34monthsold—equivalenttoabout70humanyears.EattoTheresearcherscheckedtheactivityof11,000genesfromthemouselivers,andfoundthat46changedwithageinthenormallyfedmice.Thechangeswereassociatedwiththingslikeinflammationandfreeradicalproduction—probablybadnewsformousehealth.Inthemicethathaddietedalltheirlives,27ofthose46genescontinuedtobehavelikeyounggenes.Butthemostsurprisingfindingwasthatthemicethatonlystarteddietinginoldagealsobenefitedfrom70percentofthesegenechanges.

Whatcanbeinferredabout ynormallyfedmicementionedinthepassage?D)Theyaremorelikelytosufferfrominflammation.Accordingtotheauthor,whichofthefollowingmostinterestedtheresearchers?A)Themicethatstarteddietinginoldage.Eatto"Thisisthefirstindicationthattheseeffectskickinprettyquickly,”saysHuberWarnerfromtheNationalInstituteonAgingnearWashingtonD.C.Nooneyetknowsifcalorierestrictionworksinpeopleasitdoesinmice,butSpindlerishopeful.“There’sattractingandtemptingevidenceouttherethatitwillwork,”hesays.EattoIfitdoesworkinpeople,theremightbegoodreasonsforrejuvenatingtheliver.Aswegetolder,ourbodiesarelessefficientatmetabolizingdrugs,forexample.Abriefperiodoftimeofdieting,saysSpindler,couldbeenoughtomakesureadrugiseffective.EattoButSpindlerisn’tsurethetrade-offisworthit.“Themicegetlessdisease,theylivelonger,butthey’rehungry,”hesays.“Evenseeingwhatadietdoes,it’sstillhardtogotoarestaurantandsay:‘IcanonlyeathalfofSpindlerhopeswesoonwon’tneedtodietatall.Hiscompany,LifespanGeneticsinCalifornia,islookingfordrugsthathavethe