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1、一Amongallthemalignancieslungcanceristhebiggestkillermethan100000Americansdieofthediseasegivingupsmokingisoneofobviouswaystoreducetheriskbutanotheranswermaylieinthekitchen.Accdingtoanewreptevenheavysmokersmaybeprotectedfr

2、omdevelopinglungcancerbyeatingadailyptionofcarrotsspinachanyothervegetablefruitcontainingafmofvitaminAcalledcarotene.ThefindingpublishedinTHELANCETispartofalongrangeinvestigationofdietdisease.Since1957someAmericanresearc

3、hershavemonitedthedietaryhabitsmedicalhistiesof2000dleagedmenemployedbytheWesternElectricCo.inChicago.LedbyDr.RidShekelleofSt.Luke’sMedicalCentertheresearchersrecentlybegantostoutthelinksbetweenthesubjects’dietarypattern

4、scancer.OtherstudiesofanimalshumanshavesuggestedthatvitaminAofferssomeprotectionagainstlungcancer.ThecrelationseemedlogicalexplainsShekellesincevitaminAisessentialfthegrowthoftheepithelialtissuethatlinestheairwaysofthelu

5、ngs.Vegetables:Buttheearlierresearchdidnotdistinguishbetweenthetwodifferentfmsofthevitamin.“Prefmed”vitaminAknownasretinolisfoundmainlyinliverdairyproductslikemilkcheesebuttereggs.ButvitaminAisalsomadeinthebodyfromcarote

6、newhichisabundantinavarietyofvegetablesfruitsincludingcarrotsspinachsquashtomatoessweetpotatoesapples.InthestudyShekellehiscolleaguesfoundlittlecrelationbetweentheincidenceoflungcancertheconsumptionoffoodscontainingprefm

7、edvitaminA.Butwhentheyexaminedthedataoncaroteneintaketheydiscoveredasignificantrelationship.Amongthe488menwhohadthelowestlevelofcaroteneconsumptiontherewere14casesoflungcancerinagroupofthesamesizethatatethemostcaroteneon

8、lytwocasesdeveloped.Theapparentprotectiveeffectofcaroteneheldupevenflongtimesmokers—buttoalesserdegree.Furtherstudieswillbenecessarybefethelinkbetweenlungcancercarotenecanbefirmlyestablished.Inthemeantimeresearcherswarna

9、gainsttakinglargenumbersofvitaminApillsbecausethetabletscontainafmofthechemicalthatcanbeextremelytoxicinhighdoses.Insteadtheyadviseawellbalanceddietthatincludesgoodsrichin“Therearestepsdown”saidGerald.Veryslowlycarefully

10、theywentdownthesteps.Geraldstruckamatchwhenthelaststepwasfoundtohavenoedgetobeinfactthebeginningofapassageturningtotheleft.“This”saidJimmy“mighttakeusbacktotheroad.”“underit”saidGerald“we’vecomedownelevensteps.”Theywento

11、nfollowingGeraldwhowentveryslowlyffearasheexplainedofsteps.Thepassagewasverydark.ThencameaglimmerofdaylightthatgrewgrewpresentlyendedinanotherarchthatlookedoutoverascenesolikeapictureoutofabookaboutItalythateveryone’sbre

12、athwastakenawaytheysimplywalkedfwardsilentstaring.Ashtavenueofcypressesledwindingasitwenttoamarbleterracethatlaybroadwhiteinthesunlight.Thechildrenblinkingleanedtheirarmsontheflatbalustrade(欄桿)gazed.Immediatelybelowthemw

13、asalakewithswansanislwithwillowtreesamongthetreesgleamedthewhitefiguresofstatues.Againstahilltotheleftwasaroundwhitebuildingwithpillarstotherightawaterfallcametumblingdownamongmossystonestosplashintothelake.Stepswentfrom

14、theterracetothewaterotherstepstothegreenlawnsbesideit.Awayacrossthegrassyslopesdeerwerefeedinginthedistancewasanenmoushouseofgreystonelikenothingthechildrenhadeverseenbefe.“Itisanenchantedcastle”saidGerald.“Therearen’tan

15、yenchantedcastles”saidJimmy“yououghttoknowthat.”“WellanywayI’mgoingtoexple”saidGerald.“Youneedn’tcomeifyoudon’twantto.”Theothersfollowed.Thereneverwassuchagarden—outofapictureafairytale.Theypassedquiteclosetothedeerwhoon

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