请阅读Passagel，完成第小题。 Passage1 MoveoverMethuselah.Futuregeneratio

请阅读Passagel，完成第小题。 Passage1 MoveoverMethuselah.FuturegenerationscouldbelivingwellintotheirsecondcenturyandstilldoingSudoku,iflifeexpectancypredictionsaretrue.Increasingbytwoyearseverydecade,theyshownosignsofflatteningout.Averagelifespanworldwideisalreadydoublewhatitwas200yearsago.Sincethe1980s,expertsthoughttheincreaseinlifeexpectancywouldslowdownandthenstop,butforecastershaverepeatedlybeenprovedwrong. Thereasonbehindthesteadyriseinlifeexpectancyis"thedeclineinthedeathrateoftheelderly",saysProfessorTomKirkwoodfromNewcastleUniversity.Hemaintainsthatourbodiesareevolvingtomaintainandrepairthemselvesbetterandourgenesareinvestinginthisprocesstoputoffthedamagewhichwilleventuallyleadtodeath.Asaresult,thereisnoceilingimposedbytherealitiesoftheageingprocess."Thereisnouse-by-datewhenweage.Ageingisnotafixedbiologicalprocess,"Tomsays. Alargestudyofpeopleaged85andovercarriedoutbyProfessorKirkwooddiscoveredthattherewerearemarkablenumberofpeopleenjoyinggoodhealthandindependenceintheirlate80sandbeyond.Withpeoplereachingoldageinbettershape,itissafetoassumethatthisisallduetobettereatinghabits,livingconditions,educationandmedicine. Therearestillmanypeoplewhosufferfrommajorhealthproblems,butmodernmedicinemeansdoctorsarebetteratmanaginglong-termhealthconditionslikediabetes,highbloodpressureandheartdisease."Wearereachingoldagewithlessaccumulativedamagethanpreviousgenerations.Wearelessdamaged,"saysProfessorKirkwood.Oursofterlivesandtheimprovementsinnutritionandhealthcarehavehadadirectimpactonlongevity. Nearlyone-in-fivepeoplecurrentlyintheUKwilllivetoseetheir100thbirthday,theOfficeforNationalStatisticspredictedlastyear.LifeexpectancyatbirthhascontinuedtoincreaseintheUK--from73.4yearsfortheperiod1991to1993to77.85yearsfor2007to2009.AreportinSciencefrom2002whichlookedatlifeexpectancypatternsindifferentcountriessince1840concludedthattherewasnosignofanaturallimittolife. ResearchersJimOeppenandDr.JamesVaupelfoundthatpeopleinthecountrywiththehighestlifeexpectancywouldlivetoanaverageageof100inaboutsixdecades.Buttheystoppedshortofpredictinganythingmore. "Thisisfarfrometernity:modestannualincrementsinlifeexpectancywillneverleadtoimmortality,"theresearcherssaid. Wedonotseemtobeapproachinganythinglikethelimitsoflifeexpectancy,saysProfessorDavidLeonfromtheLondonSchoolofHygieneandTropicalMedicine."Therehasbeennoflatteningoutofthebestofthebest--thegroupswhicheveryoneknowshavegoodlifeexpectancyandlowmortality,"hesays. Thesegroups,whichtendtobeinthehighersocialandeconomicgroupsinsociety,canliveforseveralyearslongerthanpeopleinlowersocialgroups,promptingcallsforanendtoinequalitieswithinsocieties. Withinpopulations,genesalsohaveanimportantroletoplayindetermininghowlongwecouldsurvivefor--butenvironmentisstillthemostimportantfactor. Itisnosurprisethathealthy-livingsocietieslikeJapanhavethehighestlifeexpectanciesintheworld.Butitwouldstillbeincredibletothinkthatlifeexpectancycouldgoonrisingforever."Iwouldbettherewillbefurtherincreasesinlifeexpectancyandthenitwillprobablybegintoslow,"saysTom,"butwejustdon'tknow." WhichstatementbelowisTRUEconcerninglifeexpectancyaccordingtothepassage? 查看材料

A.Life expectancy goes on rising forever.

B.There could be further increases in life expectancy.

C.Life expectancy has slowed down since 1950s and it will stop.

D.Life expectancy in Japan doubles what it was 200 years ago.

正确答案是B