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1、第三部分完形填空GeneticEngineeringManypeopleareunawarethatalotofthefoodstheyeateveryday,suchasbreadhamandcheese,havebeenalteredbyusingnewtechnology.Foodcanbechanged.Itcanbemadetotastedifferentortolookdifferent—carrotscanbemadetotasteofchocolateandapplescanbemaderedder.Some
2、foodthatappearsthesamehasbeenscientificallyimproved,forexample,fishcanbemadetogrowfaster.Shouldwebepleasedorworried?Willnewtechnologybringbenefits,orisitabouttogooutofcontrol?Geneticallyengineeredfoodsareproducedbytakinggeneticmaterialfromonespeciesandtransferringi
3、ttoanother.Forexample,an‘antifreeze’genewhichappearsnaturallyinArcticfishhasbeenintroducedintotomatoesandstrawberriessothattheydon'tfreezeincoldweather;ahumangenehasbeenintroducedintopigstomakethemgrowmorequickly.Someclaimgreatadvantages.Theypointoutthatcropscanbem
4、adestrongerandmorediseaseresistant,sopesticidescanbereduced.Theyalsomaintainthatfoodcanbemademorenutritiousorthatthefatcontentcanbereducedtomakeithealthier.Scientistsareworkinghardtodevelopbetteraerialsformobilephones,aspokesmanforPhikiaPhonessaidtoday.‘Itreallyirr
5、itatesuserswhentheylosethesignalinthemiddleofacall,sowearedevelopingnewaerialsthatwillenableuserstoreceivestrongersignals.Manyusersreportedthatwhentheyweretravelling,thesignalwasoftenlost’,saidthespokesman.Thenewaeralsaredesignedtoavoidlosingthesignalbyreceivingthe
6、messageonawiderrangeofradiofrequencies.‘Wehavelearntthatthisisamajorconcernforphoneusers’saidthespokesman.Thenewphoneshaveaflexibleexternalaerial,whichuserswillhavetogetusedtotouchingtheirearorhead.Theaerials--makethephonesabletopickupawiderrangeofsignals.Thecompan
7、yspokesmaninsistedthat_thiswasnotapotentialdanger–“Every_safetyregulationhasbeenfollowed”,hetoldourreporter.“IfI’dhadoneofthesephonesthismorning,Iwouldn’thavemissedmytraincominghere”,jokedthespokesman.ThebiggestadventureI'veeverhadwastrekkinginThailand.Wehiredaguid
8、e(16)totakeustoavillageinthejungle.Wedidn'tknowthathe(17)hadneverbeentherebefore.(18)Unlesswereachedthevillage,wewouldn'tbeabletofindsomewheretos
