2019高考英语一轮复习 unit 1 tales of the unexplained 牛津译林版必修2

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1、Unit1Talesoftheunexplained一、阅读理解Nowadaysmoreandmorepeoplearetalkingaboutgeneticallymodifiedfoods(GMfoods).GMfoodsdevelopfromgeneticallymodifiedorganisms(有机体),whichhavehadspecificchangesintroducedintotheirDNAbygeneticengineeringtechniques.Thesetechniquesaremuchmoreprecisewhe

2、reanorganismisexposedtochemicalstocreateanonspecificbutstablechange.Formanypeople,thehightechproductionraisesallkindsofenvironmental,ethical,healthandsafetyproblems.Particularlyincountrieswithlongfarmingtraditions,theideaseemsagainstnature.Infact,GMfoodsarealreadyverymuch

3、apartofourlives.Theywerefirstputonthemarketin1996.AthirdofthecornandmorethanhalfthecottongrownintheU.S.lastyearwastheproductofbiotechnology,accordingtotheDepartmentofAgriculture.Morethan65millionacresofgeneticallymodifiedcropswillbeplantedintheUSthisyear. Thegeneticgenieiso

4、utofthebottle.However,likeanynewproductenteringthefoodchain,GMfoodsmustbesubjectedtocarefultesting.Inwealthycountries,thedebateaboutbiotechisnotsofiercebythefactthattheyhavealargenumberoffoodstochoosefrom,andasupplythatgoesbeyondtheneeds.Indevelopingcountriesdesperatetofeed

5、fastgrowingandunderfedpopulations,thematterissimplerandmuchmoreurgent:dothebenefitsofbiotechoutweightherisks?Thestatisticsonpopulationgrowthandhungeraredisturbing.Lastyeartheworld'spopulationreached6billion.TheUNstatesthatnearly800millionpeoplearoundtheworldareunhealthy.Ab

6、out400millionwomenofchildbearingagedon'thaveenoughiron,whichmeanstheirbabiesareexposedtovariousbirthdefeats.Asmanyas100millionchildrensufferfromvitaminAdeficiency,aleadingcauseofblindness.Howcanbiotechhelp?Geneticengineeringiswidelyusedtoproduceplantsandanimalswithbetternut

7、ritionalvalues.Biotechnologistshavedevelopedgeneticallymodifiedriceandtheyareworkingonotherkindsofnutritionallyimprovedcrops.Biotechcanalsoimprovefarmingproductivityinplaceswherefoodshortagesarecausedbycropdamageattributabletodrought,poorsoilandcropviruses.1.Thepassagemainl

8、ytalksabout________.A.theworld'sfoodproblemB.thedevelopmentinbiotechC.thegenetical