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1、2010年英语二Reading-PartBDirections：Readthefollowingtextanddecidewhethereachofthestatementsistrueorfalse.ChooseTifthestatementistrueorFitthestatementisnottrue.MarkyouranswersonANSWERSHEET1.(10points)CopyingBirdsMaySaveAircraftFuelBothBoeingandAirbushavet
2、rumpetedtheefficiencyoftheirnewestaircraft,the787and350respectively.Theircleverdesignsandlightweightcompositescertainlymakeadifference.ButagroupofresearchersatStanfordUniversity,ledbyIlanKroo,hassuggestedthatairlinescouldtakeamorenaturalisticapproach
3、tocuttingjet-fueluseanditwouldnotrequirethemtobuynewaircraft.Theanswer,saysDrKroo,lieswithbirds.Since1914,scientistshaveknownthatbirdsflyinginformation-aV-shape-expendlessenergy.Theairflowingoverabird’swingscurlsupwardsbehindthewingtips,aphenomenonkn
4、ownasupwash.Otherbirdsflyingintheupwashexperiencereduceddrag,andspendslessenergypropellingthemselves.PeterLissaman,anaeronauticsexpertwhowasformerlyatCaltechandtheUniversityofSouthernCalifornia,hassuggestedthataformationof25birdsmightenjoyarangeincre
5、aseof71%.Whenappliedtoaircraft,theprinciplesarenotsubstantiallydifferent.DrKrooandhisteammodeledwhatwouldhappenifthreepassengerjetsdepartingfromLosAngeles,SanFranciscoandIasVegasweretoassembleoverUtah,assumeaninvertedV-formationoccasionallychangeplac
6、essoallcouldhaveaturninthemostfavorablepositions,andproceedtoLondon.Theyfoundthattheaircraftconsumedasmuchas15%lessfuel(coupledwithareductionincarbon-dioxideoutput).Nitrogen-oxideemissionsduringthecruisingportionsoftheflightfellbyaroundaquarter.There
7、are,ofcourse,knotstobeworkedout.Oneconsiderationissafety,oratleasttheperceptionofit.Wouldpassengersfeelcomfortabletravellingincompanion?DrKroopointsoutthattheaircraftcouldbeseparatedbyseveralnauticalmiles,andwouldnotbeintheintimategroupingsfavoredbyd
8、isplayteamsliketheRedArrows,Apassengerpeeringoutofthewindowmightnotevenseetheotherplanes.Whethertheseparationdistancesinvolvedwouldsatisfyair-traffic-controlregulationsisanothermatter,althoughaworkinggroupattheInternationalCivilAviationOrganizationha
