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Lesson9Flyingcats飞猫听录音，然后回答以下问题。Howdocatstrytoprotectthemselveswhenfallingfromgreatheights?Catsneverfailtofascinatehumanbeings.Theycanbefriendlyandaffectionatetowardshumans,buttheyleadmysteriouslivesoftheirownaswell.Theyneverbecomesubmissivelikedogsandhorses.Asaresult,humanshavelearnedtorespectfelineindependence.Mostcatsremainsuspiciousofhumansalltheirlives.Oneofthethingsthatfascinatesusmostaboutcatsisthepopularbeliefthattheyhaveninelives.Apparently,thereisagooddealoftruthinthisidea.Acat'sabilitytosurvivefallsisbasedonfact.RecentlytheNewYorkAnimalMedicalCentermadeastudyof132catsoveraperiodoffivemonths.Allthesecatshadoneexperienceincommon:theyhadfallenoffhighbuildings,yetonlyeightofthemdiedfromshockorinjuries.Ofcourse,NewYorkistheidealplaceforsuchaninterestingstudy,becausethereisnoshortageoftallbuildings.Thereareplentyofhigh-risewindowsillstofallfrom!Onecat,Sabrina,fell32storeys,yetonlysufferedfromabrokentooth.'Catsbehavelikewell-trainedparatroopers.'adoctorsaid.Itseemsthatthefurthercatsfall,thelesstheyarelikelytoinjurethemselves.Inalongdrop,theyreachspeedsof60milesanhourandmore.Athighspeeds,fallingcatshavetimetorelax.Theystretchouttheirlegslikeflyingsquirrels.Thisincreasestheirair-resistanceandreducestheshockofimpactwhentheyhittheground.Lesson12Lifeonadesertisland荒岛生活听录音，然后回答以下问题。Whatwasexceptionalaboutthetwomen'sstayonthedesertisland?Mostofushaveformedanunrealisticpictureoflifeonadesertisland.Wesometimesimagineadesertislandtobeasortofparadisewherethesunalwaysshines.Lifethereissimpleandgood.Ripefruitfallsfromthetreesandyouneverhavetowork.Theothersideofthepictureisquitetheopposite.Lifeonadesertislandiswretched.YoueitherstarvetodeathorlivelikeRobinsonCrusoe,Waitingforaboatwhichnevercomes.Perhapsthereisanelementoftruthinboththesepictures,butfewushavehadtheopportunitytofindout.Twomenwhorecentlyspentfivedaysonacoralislandwishedtheyhadstayedtherelonger.TheyweretakingabadlydamagedboatfromtheVirginIslandstoMiamitohaveitrepaired.Duringthejourney,theirboatbegantosink.Theyquicklyloadedasmallrubberdinghywithfood,matches,andcansofbeerandrowedforafewmilesacrosstheCaribbeanuntiltheyarrivedatatinycoralisland.Therewerehardlyanytreesontheislandandtherewasnowater,butthisdidnotprovetobeaproblem.Themencollectedrainwaterintherubberdinghy.Astheyhadbroughtaspeargunwiththem,theyhadplentytoeat.Theycaughtlobsterandfisheveryday，and,asoneofthemputit'atelikekings'.Whenapassingtankerrescuedthemfivedayslater,bothmenweregenuinelysorrythattheyhadtoleave.Lesson23Oneman'smeatisanotherman'spoison各有所爱听录音，然后回答以下问题。Whatwasitaboutsnailsthatmadethewritercollectthemforhisfriendonthatinparticular?Peoplebecomequiteillogicalwhentheytrytodecidewhatcanbeeatenandwhatcannotbeeaten.IfyoulivedintheMediterranean,forinstance,youwouldconsideroctopusagreatdelicacy.Youwouldnotbeabletounderstandwhysomepeoplefinditrepulsive.Ontheotherhand,yourstomachwouldturnattheideaoffryingpotatoesinanimalfat--thenormallyacceptedpracticeinmanynortherncountries.Thesadtruthisthatmostofushavebeenbroughtuptoeatcertainfoodsandwesticktothemallourlives.Nocreaturehasreceivedmorepraiseandabusethanthecommongardensnail.Cookedinwine,snailsareagreatluxuryinvariouspartsoftheworld.Therearecountlesspeoplewho,eversincetheirearlyyears,havelearnedtoassociatesnailswithfood.Myfriend,Robert,livesinacountrywheresnailsaredespised.Ashisflatisinalargetown,hehasnogardenofhisown.Foryearshehasbeenaskingmetocollectsnailsfrommygardenandtakethemtohim.Theideaneverappealedtomeverymuch,butoneday,afterheavyshower,IhappenedtobewalkinginmygardenwhenInoticedahugenumberofsnailstakingastrollonsomeofmyprizeplants.Actingonasuddenimpulse,Icollectedseveraldozen,puttheminapaperbag,andtookthemtoRobert.Robertwasdelightedtoseemeandequallypleasedwithmylittlegift.IleftthebaginthehallandRobertandIwentintothelivingroomwherewetalkedforacoupleofhours.IhadforgottenallaboutthesnailswhenRobertsuddenlysaidthatImuststaytodinner.Snailswould,ofcourse,bethemaindish.IdidnotfancytheideaandIreluctantlyfollowedRobertoutoftheroom.Toourdismay,wesawthatthereweresnailseverywhere:theyhadescapedfromthepaperbagandhadtakencompletepossessionofthehall!Ihaveneverbeenabletolookatasnailsincethen.Lesson27Nothingtosellandnothingtobuy不卖也不买听录音，然后回答以下问题。Listentothetapethenanswerthequestionbelow.Whatisthemostimportantthingforatramp?Ithasbeensaidthateveryonelivesbysellingsomething.Inthelightofthisstatement,teacherslivebysellingknowledge,philosophersbysellingwisdomandpriestsbysellingspiritualcomfort.Thoughitmaybepossibletomeasurethevalueofmaterialgoodintermsofmoney,itisextremelydifficulttoestimatethetruevalueoftheserviceswhichpeopleperformforus.Therearetimeswhenwewouldwillinglygiveeverythingwepossesstosaveourlives,yetwemightgrudgepayingasurgeonahighfeeforofferinguspreciselythisservice.Theconditionsofsocietyaresuchthatskillshavetobepaidforinthesamewaythatgoodsarepaidforatashop.Everyonehassomethingtosell.Trampsseemtobetheonlyexceptiontothisgeneralrule.Beggarsalmostsellthemselvesashumanbeingtoarousethepityofpassers-by.Butrealtrampsarenotbeggars.Theyhavenothingtoselland