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时间:2020-08-12
《《新目标英语中考二轮复习》中考英语复习 难度较大的阅读文章含答案(五).pdf》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第一篇“Salty”RicePlantBoostsHarvestsBritishscientistsarebreedinganewgenerationofriceplantsthatwillbeabletogrowinsoilcontainingsaltwater.Theirworkmayenableabandonedfarmstobecomeproductiveoncemore.TimFlowersandTonyYeo,fromSussexUniversity’sSchoolofBiologicalSciences,havespen
2、tseveralyearsresearchinghowcrops,suchasrice,couldbemadetogrowinwaterthathasbecomesalty.Thepairhaverecentlybegunathree-yearprogramme,fundedbytheBiotechnologyandBiologicalSciencesResearchCouncil,toestablishwhichgenesenablesomeplantstosurvivesaltyconditions.Theaimistobreed
3、thiscapabilityintocrops,startingwithrice.Itisestimatedthateachyearmorethan10mhectares(公顷)ofagriculturallandarelostbecausesaltgetsintothesoilandstunts(妨碍生长)plants.Theproblemiscausedbyseveralfactors.Inthetropics,mangroves(红树林)thatcreateswamps(沼泽)andtraditionallyformedbarr
4、ierstoseawaterhavebeencutdown.IntheMediterranean,aseriesofdroughtshavecausedthewatertabletodrop,allowingseawatertoseep(渗透)in.inLatinAmerica,irrigationoftencausesproblemswhenwaterisevaporated(蒸发)bytheheat,leavingsaltdepositsbehind.Excesssaltthenenterstheplantsandprevents
5、themfunctioningnormally.Heavyconcentrationsofmineralsintheplantsstopthemdrawingupthewatertheyneedtosurvive.Toovercometheseproblems,FlowersandYeodecidedtobreedriceplantsthattakeinverylittleslatandstorewhattheydoabsorbincellsthatdonotaffecttheplants‘growth.Theyhavestarted
6、tobreedthesecharacteristicsintoanewricecrop,butitwilltakeabouteightharvestsbeforetheresultingseedsarereadytobeconsideredforcommercialuse.Oncethecharacteristicsforsurvivingsaltysoilareknown,FlowersandYeowilltrytobreedtheappropriategenesintoallmannersofcropsandplants.Land
7、thathasbeenabandonedtonaturewillthenbeabletobloomagain,providingmuchneededfoodinthepoorercountriesoftheworld.31WhichofthefollowingstatementsaboutFlowersandYeoistrue?ATheyarestudentsatSussexUniversity.BTheyarericebreeders.CTheyarehusbandandwife.DTheyarecolleaguesataninst
8、itutionofhigherlearning.32FlowersandYeohavestartedaprogrammeAtofindwaystopreventwaterpollution.Btoidentifygene
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