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　　Britishscientistsarebreedinganewgenerationofriceplantsthatwillbeabletogrow.insoilcontainingsaltwater.Theirworkmayenableabandonedfarmstobecomeproductivefarmsoncemore.TimFlowersandTonyYeo,fromSussexUnive

　　Britishscientistsarebreedinganewgenerationofriceplantsthatwillbeabletogrow.insoilcontainingsaltwater.Theirworkmayenableabandonedfarmstobecomeproductivefarmsoncemore.

　　TimFlowersandTonyYeo,fromSussexUniversity’sSchoolofBiologicalSciences,.havespentseveralyearsresearchinghowcrops,suchasrice,couldbemadetogrowinwaterthathasbecomesalty.Thepairshaverecentlybegunathree-yearprogramme,fundedbytheBiotechnologyandBiologicalSciencesResearchCouncil,toestablishwhichgenesenablesomeplantstosurvivesaltyconditions.Theaimistobreedthiscapabilityintocrops,startingwithrice.

　　Itisestimatedthateachyearmorethan10millionhectares(公顷)ofagriculturallandarelostbecausesaltgetsintothesoilandstunts(防碍生长)plants.Theproblemiscausedbyseveralfactors.Inthetropics,mangrovesthatcreateswamps(沼泽)andtraditionallyformedbarrierstoseawaterhavebeencutdown.IntheMediterranean,aseriesofdroughtshavecausedthewatertabletodrop,allowingseawatertoseep(渗透)in.InLatinAmerica,irrigationoftencausesproblemswhenwaterisevaporatedbytheheat,leaving,saltdepositsbehind.

　　Excesssaltthenenterstheplantsandpreventsthemfunctioningnormally.Heavyconcentrationsofmineralsintheplantsstopthemdrawingupthewatertheyneedtosurvive.

　　Toovercometheseproblems.FlowersandYeodecidedtobreedriceplantsthattakeinverylittlesaltandstorewhattheydoabsorbincellsthatdonotaffecttheplants’growth.Theyhavestartedtobreedthesecharacteristicsintoanewricecrop,butitwilltakeabouteightharvestsbeforetheresultingseedsarereadytobeconsideredforcommercialuse.

　　Oncethecharacteristicsforsurvivingsaltysoilareknown,FlowersandYeowilltrytobreedtheappropriategenesintoallmannersofcropsandplants.Landthathasbeenabandonedtonaturewillthenbeabletobloomagain,providingmuchneededfoodforthepoorercountriesoftheworld.

　　4.WhichofthefollowingstatementsaboutFlowersandYeoistrue?

　　A.TheyarestudentsatSussexUniversity. B.Theyarericebreeders.

　　5.WhichofthefollowingisNOTmentionedasacauseoftheproblemdiscussedinthepassage?

　　A.Naturalbarri

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2020-09-0312:57

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　　4-7 DCAA

　　4. 推断题。从第二段中的TimFlowersandTonyYeo，fromSussexUniversity’sSchoolofBiologicalSciences，havespentseveralYearsresearchinghowcrops，可知，他们是来自大学的老师，他们是搭档，而不是夫妻，所以可以排除A项和C项；B项的意思更不正确。

　　5. 细节题。A项内容与文章中的traditionallyformedbarrierstoseawaterhavebeencutdown一致，B项内容与文章中的aseriesofdroughtshavecausedthewatertabletodrop一致，D项内容与文章中的whenwaterisevaporatedbytheheat一致，而C项内容在文章中根本没有谈到。

　　6. 词义题。我们可以根据句子的意思作出推断。

　　7. 推断题。从文章最后一段可以看出，作者对这种实验是“肯定的”。主要表现在Landthathasbeenabandonedtonaturewillthenbeableto.bloomagain，providingmuchneededfoodforthepoorercountriesoftheworld，作者认为如果该实验成功的话，废弃的土地又会肥沃起来。