北京主城区高三英语二模阅读C篇汇总 带答案.docx
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北京主城区高三英语二模阅读C篇汇总带答案
2021城区高三英语二模阅读C篇汇总
2021海淀二模
C
Fortoday'sincreasinglyinterconnectedfoodsupplychains,“efficient”iswhatit'ssupposedtobe:
Eachcountryspecializesinwhatit'sbestatandputsitontheglobalmarket.Producersandprocessorswithincountriesspecialize,too,asawaytominimizecosts.Asaresult,atleastintheory,pricesstaylow,theworldgetsfedandeveryonewins.
However,thecoronaviruscrisisdemonstrateswhatiswrongwiththisapproach.Whenbarrierspreventfoodfromreachingitsmarkets,ordemandsuddenlydrops——bothofwhicharehappeningnow——thesystemfallsapart.
Specializationofthefoodsystemmakesithardtoshiftintodifferentmarketswhendisruptionsarise.Belgium,aleadingexporterofpotatoes,lostsalesnotonlytolocalrestaurantsbutalsotoothercountriesbecauseoflockdowns(封锁)).AtleasttheBelgianscantrytoeatthepotatoesathome.Thatstrategywon'tworkforeverycrop:
Ghana,theworld’stopcocoaexporter,lostmarketswhenpeoplestartedfocusingonbuyingessentialitemsinsteadofchocolate.
ThelossinexportincomeinAfricamoregenerallycouldhaveahugeimpactifthepandemiccontinues,asmanycountriesthererelyheavilyonimportedwheatandrice.Thepricesofthesegrainshavesoarednotonlybecauseofrisingdemandforthesegrainsduringthecrisis,butalsobecauseafewcountries——includingRussiaandVietnam——imposedexportrestrictionsoutoffearthatsendingfoodabroadwouldleadtohigherpricesathome.
Concentratedmarketsdominatedbyjustahandfulofcompaniesheightenfoodsystemfragility.Forexample,justthreemeatpackingplantsprocessover95percentofCanada'sbeefandnearlyallofitsbeefexports.Now,thosemeatprocessingplantshavehadtotemporarilyshutdownbecauseofoutbreaksofCOVID-19amongworkers.
Seeingthespoiledproductsacrosstheworldshouldforceallofustorethinkour"efficient”foodsupplies.Weneedtorejuvenate(使恢复活力)localandregionalfoodsystemstoreducethevulnerabilitiesthatcomewithbeingtooreliantonimportedandcorporate-dominatedfoods.Thisdoesn'tmeancuttingoffalltradeorabolishingallpackagedfoods,butitdoesmeanbuildingdiversity,andincreasingopportunitiesforsmallandmedium-scaleenterprisestoflourishinshorter,moresustainablefoodsupplychainsthatareclosertohome.
Oneplacetostartisforgovernmentstoshifttheirsupportfromthelarge-scale,specializedandexport-orientedfoodsystemtobuildinginfrastructureformorediverselocalfoodsystems.Aroundtheworld.small-scaleandorganicproducershavebeenoverwhelmedwiththesurgeininterestfromcustomerswhowanttobuydirectlyfromfarmersduringthecrisis.Buttheseproducersoftenlacktheinfrastructuretomeetthatdemand.Asgovernmentsaroundtheworldpassstimuluspackagestoaddressthecrisis,buildingmorediverseandlocalizedfoodsystemsshouldbeanobviousinclusion.
27.Intheory,specializationofthefoodsystem.
A.adaptstochangesefficientlyB.balancessupplyanddemand
C.focusesonessentialitemsD.reducescostsof
28.Theunderlinedword"fragility"inParagraph5means.
A.weaknessB.diversity
C.unfairnessD.complexity
29.Whatcanwelearnfromthepassage?
A.Afewcountriesrestrictexportstostabilizelocalfoodprices.
B.GrainpricesriseduetoAfrica'sdependenceonimportation.
C.GhanamightbelessaffectedbylockdownsthanBelgiumwas.
D.Packaged-foodconsumptionshouldbeencouragedtoaddressthecrisis.
30.Themainpurposeofthispassageisto.
A.exposefoodsecurityissuesduringthecrisis
B.advocateestablishingdiverselocalfoodsystems
C.discussthedevelopmentofasustainableeconomy
D.provetheimportanceofsoundgovernmentpolicies
2021西城二模
C
Urbanplannersmaysoonhaveanewwaytomeasuretrafficjams.Byputtinginthedifferentroutesbywhichvehiclescantravelbetweenlocations,researchershavedevelopedanewcomputeralgorithm(运算法则)thathelpsquantifyregionsofjamsinurbanareasandsuggestswaysaroundthem.
ThestudypublishedintheJournalofPhysics:
Complexity,usedtrafficspeedsfromtaxisinNewYorkCitytodemonstratehowroadinfrastructure(基础设施)anddriverbehaviorcancreatecomplexroadnetworksthatdifferamongcities.
Theteamapproachedtheissuebydesigningacomputeralgorithmtocapturethetopology-orrelationshipbetweenthedifferentroutesbetweenlocations--ofroadnetworks.“WefoundthatthemostsignificanttrafficbottlenecksinManhattanseemtoariseasaresultofthecity'sstructurallayout,”saidstudyco-authorDanielCarmody."Forexample,thefactthatabridgeentersManhattanatarangewheretrafficisalreadylimitedduetoCentralParkslowstrafficintheareaconsiderably.”
TheresearchersperformedacomparativeanalysisusingtrafficpatternsinChengdu,China,totest