电大考试英语II2历届试题汇编Word格式.docx
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电大考试英语II2历届试题汇编Word格式.docx
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GeneticEngineering
Manypeopleareunawarethatalotofthefoodstheyeateveryday,suchasbreadhamandcheese,havebeenalteredbyusingnewtechnology.Foodcanbechanged.Itcanbemadetotastedifferentortolookdifferent—carrotscanbemadetotasteofchocolateandapplescanbemaderedder.Somefoodthatappearsthesamehasbeenscientificallyimproved,forexample,fishcanbemadetogrowfaster.Shouldwebepleasedorworried?
Willnewtechnologybringbenefits,orisitabouttogooutofcontrol?
Geneticallyengineeredfoodsareproducedbytakinggeneticmaterialfromonespeciesandtransferringittoanother.Forexample,an‘antifreeze’genewhichappearsnaturallyinArcticfishhasbeenintroducedintotomatoesandstrawberriessothattheydon'
tfreezeincoldweather;
ahumangenehasbeenintroducedintopigstomakethemgrowmorequickly.
Someclaimgreatadvantages.Theypointoutthatcropscanbemadestrongerandmorediseaseresistant,sopesticidescanbereduced.Theyalsomaintainthatfoodcanbemademorenutritiousorthatthefatcontentcanbereducedtomakeithealthier.
Scientistsareworkinghardtodevelopbetteraerialsformobilephones,aspokesmanforPhikiaPhonessaidtoday.‘Itreallyirritatesuserswhentheylosethesignalinthemiddleofacall,sowearedevelopingnewaerialsthatwillenableuserstoreceivestrongersignals.Manyusersreportedthatwhentheyweretravelling,thesignalwasoftenlost’,saidthespokesman.Thenewaeralsaredesignedtoavoidlosingthesignalbyreceivingthemessageonawiderrangeofradiofrequencies.‘Wehavelearntthatthisisamajorconcernforphoneusers’saidthespokesman.Thenewphoneshaveaflexibleexternalaerial,whichuserswillhavetogetusedtotouchingtheirearorhead.Theaerials--makethephonesabletopickupawiderrangeofsignals.Thecompanyspokesmaninsistedthat_thiswasnotapotentialdanger–“Every_safetyregulationhasbeenfollowed”,hetoldourreporter.“IfI’dhadoneofthesephonesthismorning,Iwouldn’thavemissedmytraincominghere”,jokedthespokesman.
ThebiggestadventureI'
veeverhadwastrekkinginThailand.Wehiredaguide(16)totakeustoavillageinthejungle.Wedidn'
tknowthathe(17)hadneverbeentherebefore.(18)Unlesswereachedthevillage,wewouldn'
tbeabletofindsomewheretosleep,(19)sowewantedtogetthereinabout8hours.Aftertwohoursweallrealizedwewerelost.The(20)furtherwewalked,themoreconfusedwebecame.Luckilyafterafurther4hourswemetsomehunters.Theydidn'
tspeakthesamelanguageasourguide,butwewereableto(21)getacrossthatwewerelost.They(22)redirectedustowardsthevillage.Itwasafterdarkwhenwearrivedthere.Wehadbeenwalking(23)forover14hoursandwewere(24)absolutelyexhausted.Wehadbeenverylucky;
ifwe(25)hadn'
tmetthehunters,wewouldhavehadtosleepinthejungle.
IwastravellingaloneinWesternAustralialastyear,andonedayisetofftoclimbahighpeakinthatarea.Althoughinthesummertherearemanytourists,1wasthereoutofseasonbecausethereweren'
tanytourgroups.SoonafterIreachedthetop,itbegantodrizzleandthefogcamedown.Verysoon,itwassothickthatpath.1takemyphonewithmeeverywherebecauseyouneverknowwhenyouwillneedit.
EventuallyIcalledmydad,whowas9,000milesawayintheUK.Hetoldmetophonethelocalemergencyservices,butIfeltsostupidthatIdidn'
twantto.Luckily,mydadrealisedthisandmadeuphismindtocallthemhimself.TherescuerscalledmeonmobiletofindoutexactlywhereIwas,butunfortunatelythebatteryranoutafterfiveseconds.Ilaydownunderarockandwaited--itwasnearlynighttimeandIwascoldandwet.Justastheywereabouttocalloffthesearchforthenight,theyfoundme.Fortunatelyonerescuerhadsaid'
Let'
stryforjustfivemoreminutes.'
Iftheyhadgivenup,Iwouldhavedied.
Manypeopleareunawarethatalotofthefoodstheyeateveryday,suchasbread,hamandcheese,havebeenalteredbyusingnewtechnology.Foodcanbechanged.Itcanbemadetotastedifferentortolookdifferent-carrotscanbemadetotasteofchocolateandapplescanbemaderedder.Somefoodthatappearsthesamehasbeenscientificallyimproved,forexample,fishcanbemadetogrowfaster.Shouldwebepleasedorworried?
Geneticallyengineeredfoodsareproducedbytakinggenericmaterialfromonespeciesandtransferringittoanother.Forexample,an‘antifreeze’genewhichappearsnaturallyinArcticfishhasbeenintroducedintotomatoesandstrawberries_sothat_theydon’tfreezeincoldweather,ahumangenehasbeenintroducedintopigstomaketh
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