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1、1999Thehunter-gatherertribesthattodayliveasourprehistorichumanancestorsconsumeprimarilyavegetabledietsupplementingwithanimalfoods.Ananalysisof58societiesofmodemhunter-gatherers,includingtheKungofsouthernAfrica,revealedthatonehalfemphasizegatheringpla
2、ntfoods,one-thirdconcentrateonfishingandonlyone-sixthareprimarilyhunters.Overall,two-thirdsandmoreofthehunter-gatherer'scaloriescomefromplants.DetailedstudiesoftheKungbythefoodscientistsattheUnivers让yofLondon,showedthatgatheringisamoreproductivesourc
3、eoffoodthanishunting・Anhourofhuntingyieldsinaverageabout100ediblecalories,asanhourofgatheringproduces240.Plantfoodsprovidefor60percentto80percentoftheKung1._2._3.4._5・_6.diet,andnoonegoeshungrywhenthehuntfails.Interestingly,iftheyescapefatalinfection
4、soraccidents,thesecontemporaryaborigineslivetooldagesdespiteoftheabsenceofmedicalcare・Theyexperiencenoobesity,nomiddle-agedspread,littledental7,_decay,nohighbloodpressure,onheartdisease,andtheirbloodcholesterollevelsareverylow(abouthalfoftheaverageAm
5、ericanadult),ifnooneissuggestingwhatwereturntoanaboriginallifestyle,wecertainlycouldusetheireatinghabitsasamodelforhealthierdiet.8._9.10._2000ThegrammaticalwordswhichplaysolargeapartinEnglishgrammarareforthemostpartsharplyandobviouslydifferentfromthe
6、lexicalwords.Aroughandreadydifferencewhichmayseemthemostobviousisthatgrammaticalwordshave"lessmeaning",butinfactsomegrammarianshavecalledthem"empty"wordsasopposedinthe"full"wordsofvocabulary.Butthisisarathermisledwayofexpressingthedistinction.⑴_(2)—⑶
7、一(4)-Althoughawordlike"the"isnotthenameofsomethingas/zman,zis,itisveryfarawayfrombeingmeaningless;thereisasharpdifferenceinmeaningbetween"manisvile"andzzthemanisvile",yettheisthesinglevehicleofthisdifferenceinmeaning・(5)—(6)-Moreover,grammaticalwords
8、differconsiderablyamongthemselvesastheamountofmeaningtheyhaveeveninthelexicalsense.Anothernameforthegrammaticalwordshasbeenzzlittlewords/7ButsizeisbynomeanagoodcriterionfordistinguishingthegrammaticalwordsofEnglish,whenweconsiderthatwehavelexicalword
