2019高考英语一轮基础练 Unit 23 Conflict（含解析）北师大版选修8

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1、Unit23Conflict阅读理解ANowadaysmoreandmorepeoplearetalkingaboutgeneticallymodifiedfoods(GMfoods).GMfoodsdevelopfromgeneticallymodifiedorganisms(有机体),whichhavehadspecificchangesintroducedintotheirDNAbygeneticengineeringtechniques.Thesetechniquesaremuchmoreprecisewhereanorganismise

2、xposedtochemicalstocreateanonspecificbutstablechange.Formanypeople,thehightechproductionraisesallkindsofenvironmental,ethical,healthandsafetyproblems.Particularlyincountrieswithlongfarmingtraditions,theideaseemsagainstnature.Infact,GMfoodsarealreadyverymuchapartofourlives.T

3、heywerefirstputonthemarketin1996.AthirdofthecornandmorethanhalfthecottongrownintheU.S.lastyearwastheproductofbiotechnology,accordingtotheDepartmentofAgriculture.Morethan65millionacresofgeneticallymodifiedcropswillbeplantedintheUSthisyear. Thegeneticgenieisoutofthebottle.Howev

4、er,likeanynewproductenteringthefoodchain,GMfoodsmustbesubjectedtocarefultesting.Inwealthycountries,thedebateaboutbiotechisnotsofiercebythefactthattheyhavealargenumberoffoodstochoosefrom,andasupplythatgoesbeyondtheneeds.Indevelopingcountriesdesperatetofeedfastgrowingandunderf

5、edpopulations,thematterissimplerandmuchmoreurgent:dothebenefitsofbiotechoutweightherisks?Thestatisticsonpopulationgrowthandhungeraredisturbing.Lastyeartheworld'spopulationreached6billion.TheUNstatesthatnearly800millionpeoplearoundtheworldareunhealthy.About400millionwomenofchi

6、ldbearingagedon'thaveenoughiron,whichmeanstheirbabiesareexposedtovariousbirthdefeats.Asmanyas100millionchildrensufferfromvitaminAdeficiency,aleadingcauseofblindness.Howcanbiotechhelp?Geneticengineeringiswidelyusedtoproduceplantsandanimalswithbetternutritionalvalues.Biotechnol

7、ogistshavedevelopedgeneticallymodifiedriceandtheyareworkingonotherkindsofnutritionallyimprovedcrops.Biotechcanalsoimprovefarmingproductivityinplaceswherefoodshortagesarecausedbycropdamageattributabletodrought,poorsoilandcropviruses.1.Thepassagemainlytalksabout________.A.thewo

8、rld'sfoodproblemB.thedevelopmentinbiotechC.thegeneticallymodifiedfoo