新概念英语4课文文本.pdf

新概念英语4课文文本.pdf

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1Lesson1Wecanreadofthingsthathappened5,000yearsagointheNearEast,wherepeoplefirstlearnedtowrite.Buttherearesomepartsoftheworldwhereevennowpeoplecannotwrite.Theonlywaythattheycanpreservetheirhistoryistorecountitassagas-legendshandeddownfromonegenerationofstory-tellerstoanother.Theselegendsareusefulbecausetheycantellussomethingaboutmigrationsofpeoplewholivedlongago,butnonecouldwritedownwhattheydid.AnthropologistswonderedwheretheremoteancestorsofthePolynesianpeoplesnowlivinginthePacificIslandscamefrom.ThesagasofthesepeopleexplainthatsomeofthemcamefromIndonesiaabout2,000yearsago.Butthefirstpeoplewhowerelikeourselveslivedsolongagothateventheirsagas,iftheyhadany,areforgotten.Soarchaeologistshaveneitherhistorynorlegendstohelpthemtofindoutwherethefirstmodernmencamefrom.Fortunately,however,ancientmenmadetoolsofstone,especiallyflint,becausethisiseasiertoshapethanotherkinds.Theymayalsohaveusedwoodandskins,butthesehaverottedaway.Stonedoesnotdecay,andsothetoolsoflongagohaveremainedwheneventhebonesofthemenwhomadethemhavedisappearedwithouttrace.Lesson2Why,youmaywonder,shouldspidersbeourfriends?

Becausetheydestroysomanyinsects,andinsectsincludesomeofthegreatestenemiesofthehumanrace.Insectswouldmakeitimpossibleforustoliveintheworld;theywoulddevourallourcropsandkillourflocksandherds,ifitwerenotfortheprotectionwegetfrominsect-eatinganimals.Weowealottothebirdsandbeastswhoeatinsectsbutallofthemputtogetherkillonlyafractionofthenumberdestroyedbyspiders.Moreover,unlikesomeoftheotherinsecteaters,spidersneverdotheleastharmtousorourbelongings.Spidersarenotinsects,asmanypeoplethink,norevennearlyrelatedtothem.Onecantellthedifferencealmostataglanceforaspideralwayshaseightlegsandaninsectnevermorethansix.Howmanyspidersareengagedinthisworkonourbehalf?

OneauthorityonspidersmadeacensusofthespidersinagrassfieldinthesouthofEngland,andheestimatedthatthereweremorethan2,250,000inoneacre,thatissomethinglike6,000,000spidersofdifferentkindsonafootballpitch.Spidersarebusyforatleasthalftheyearinkillinginsects.Itisimpossibletomakemorethanthewildestguessathowmanytheykill,buttheyarehungrycreatures,notcontentwithonlythreemealsaday.IthasbeenestimatedthattheweightofalltheinsectsdestroyedbyspidersinBritaininoneyearwouldbegreaterthanthetotalweightofallthehumanbeingsinthecountry.Lesson3Modernalpiniststrytoclimbmountainsbyaroutewhichwillgivethemgoodsport,andthemoredifficultitis,themorehighlyitisregarded.Inthepioneeringdays,however,thiswasnotthecaseatall.Theearlyclimberswerelookingfortheeasiestwaytothetopbecausethesummitwastheprizetheysought,especiallyifithadneverbeenattainedbefore.Itistruethatduringtheirexplorationstheyoftenfaceddifficultiesanddangersofthemostperilousnature,equippedinamannerwhichwouldmakeamodernclimbershudderatthethought,buttheydidnotgooutoftheirwaytocourtsuchexcitement.Theyhadasingleaim,asolitarygoal-thetop!

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2Itishardforustorealizenowadayshowdifficultitwasforthepioneers.ExceptforoneortwoplacessuchasZermattandChamonix,whichhadrapidlybecomepopular,Alpinevillagestendedtobeimpoverishedsettlementscutofffromcivilizationbythehighmountains.Suchinnsastherewereweregenerallydirtyandflea-ridden;thefoodsimplylocalcheeseaccompaniedbybreadoftentwelvemonthsold,allwasheddownwithcoarsewine.Oftenavalleyboastednoinnatall,andclimbersfoundshelterwherevertheycould-sometimeswiththelocalpriest（whowasusuallyaspoorashisparishioners）,sometimeswithshepherdsorcheese-makers.Invariablythebackgroundwasthesame:

dirtandpoverty,andveryuncomfortable.Formenaccustomedtoeatingseven-coursedinnersandsleepingbetweenfinelinensheetsathome,thechangetotheAlpsmusthavebeenveryhardindeed.Lesson4IntheSovietUnionseveralcaseshavebeenreportedrecentlyofpeoplewhocanreadanddetectcolourswiththeirfingers,andevenseethroughsoliddoorsandwalls.Onecaseconcernsaneleven-year-oldschoolgirl,VeraPetrova,whohasnormalvisionbutwhocanalsoperceivethingswithdifferentpartsofherskin,andthroughsolidwalls.Thisabilitywasfirstnoticedbyherfather.Onedayshecameintohisofficeandhappenedtoputherhandsonthedoorofalockedsafe.Suddenlysheaskedherfatherwhyhekeptsomanyoldnewspaperslockedawaythere,andevendescribedthewaytheyweredoneupinbundles.VerascurioustalentwasbroughttothenoticeofascientificresearchinstituteinthetownofUIyanovsk,nearwhereshelives,