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1、第三部分完形填空GeneticEngineeringManypeopleareunawarethatalotofthefoodstheyeateveryday,suchasbreadhamandcheese,havebeenalteredbyusingnewtechnology.Foodcanbechanged.Itcanbemadetotastedifferentortolookdifferent—carrotscanbemadetotasteofchocolateandapplescanbemadered
2、der.Somefoodthatappearsthesamehasbeenscientificallyimproved,forexample,fishcanbemadetogrowfaster.Shouldwebepleasedorworried?Willnewtechnologybringbenefits,orisitabouttogooutofcontrol?Geneticallyengineeredfoodsareproducedbytakinggeneticmaterialfromonespecies
3、andtransferringittoanother.Forexample,an‘antifreeze’genewhichappearsnaturallyinArcticfishhasbeenintroducedintotomatoesandstrawberriessothattheydon'tfreezeincoldweather;ahumangenehasbeenintroducedintopigstomakethemgrowmorequickly.Someclaimgreatadvantages.The
4、ypointoutthatcropscanbemadestrongerandmorediseaseresistant,sopesticidescanbereduced.Theyalsomaintainthatfoodcanbemademorenutritiousorthatthefatcontentcanbereducedtomakeithealthier.Scientistsareworkinghardtodevelopbetteraerialsformobilephones,aspokesmanforPh
5、ikiaPhonessaidtoday.‘Itreallyirritatesuserswhentheylosethesignalinthemiddleofacall,sowearedevelopingnewaerialsthatwillenableuserstoreceivestrongersignals.Manyusersreportedthatwhentheyweretravelling,thesignalwasoftenlost’,saidthespokesman.Thenewaeralsaredesi
6、gnedtoavoidlosingthesignalbyreceivingthemessageonawiderrangeofradiofrequencies.‘Wehavelearntthatthisisamajorconcernforphoneusers’saidthespokesman.Thenewphoneshaveaflexibleexternalaerial,whichuserswillhavetogetusedtotouchingtheirearorhead.Theaerials--makethe
7、phonesabletopickupawiderrangeofsignals.Thecompanyspokesmaninsistedthat_thiswasnotapotentialdanger–“Every_safetyregulationhasbeenfollowed”,hetoldourreporter.“IfI’dhadoneofthesephonesthismorning,Iwouldn’thavemissedmytraincominghere”,jokedthespokesman.Thebigge
8、stadventureI'veeverhadwastrekkinginThailand.Wehiredaguide(16)totakeustoavillageinthejungle.Wedidn'tknowthathe(17)hadneverbeentherebefore.(18)Unlesswereachedthevillage,wewouldn'tbeabletofindsomewheretos
