职称英语历年真题《理工B》补全短文精选
职称英语历年真题《理工B》补全短文1
TheToughGrassthatSweetensOurLives.
SugarcanewasonceawildgrassthatgrewinNewGuineaandwasusedbylocalpeopleforroofingtheirhousesandfencingtheirgardens.Graduallyadifferentvarietyevolvedwhichcontainedsucrose(蔗糖)andwaschewedonforitssweettaste.Overtime,sugarcanebecameahighlyvaluablecommercialplant,grownthroughouttheworld.__________(46)
Sugarbecameavitalingredientinallkindsofthings,fromconfectionery(糖果点心)tomedicine,and,asthedemandforsugargrew,theindustrybecamelargerandmoreprofitable.__________(47)
Manycropswithered(枯萎)anddied,despitegrowersattemptstosavethem,andtherewerefearsthatthehealthoftheplantwouldcontinuetodeteriorate.
Inthe1960s,scientistsworkinginBarbodoslookedforwaystomakethecommercialspeciesstrongerandmoreabletoresistdisease.Theyexperimentedwithbreedingprogrammes,mixinggenesfromthemoredelicate,commercialtype.__________(48)Thissugarcaneisnotyetreadytobesoldcommercially,butwhenthishappens,itisexpectedtobeincredibleprofitablefortheindustry.
__________(49)Brazil,whichproducesonequarteroftheworldssugar,hascoordinatedaninternationalprojectunderProfessorPauloArrudooftheUniversidadeEstaudualdeCampinasinSaoPaulo.Teamsofexpertshaveworkedwithhimtodiscovermoreaboutwhichpartsofthegeneticstructureoftheplantareimportantfortheproductionofsugaranditsoverallhealth.
Despitealltheresearch,however,westilldonotfullyunderstandhowthegenesinsugarcane.
__________(50)Thisgeneisparticularlyexcitingbecauseitmakestheplantresistanttorust,adiseasewhichprobablyoriginatedinIndia,butisnowcapableofinfectingsugarcaneacrosstheworld.
Scientistbelievestheywilleventuallybeabletogrowaplantwhichcannotbedestroyedbyrust.
A.Eventually,acommercialplantwasdeve