公共英語三級(jí)閱讀練習(xí)題五

2019年公共英語三級(jí)閱讀練習(xí)題五2019年公共英語三級(jí)閱讀練習(xí)題五Scientistshavebeenpuzzledbythephenomenonthatmigratingbirdsflynotjustingroupsallthetime,butinVformationsandtheyhavetriedtofigureoutwhatbenefitbirdsgetfromthisparticularformation.Now,aresearchgroupfromUniversityofLondonmayhavefoundtheanswer―migratingbirdsflyinaVtosaveenergy,accordingtoastudypublishedinthejournalNature.Whenabirdflaps(振翅)itswings,itstirstheairarounditandcausesittomoveindifferentdirections.Scientistfoundinthestudythattheaircreatesanupward-movingwaveatthetipsofthewings,whichmeansthatifabirdfliesaroundthewingtipsofanotherbird,itcangetaboost(抬高)fromtherisingairandthereforeuselessenergytostayintheair.Apartformthefreeridestrategy,scientistswerealsosurprisedtoobservethatmigratingbirdstimedtheirwingbeatsandadjustedtheirpositionsinaveryprecisewaytomaximizetheliftingeffectwhileavoidingareaswheretheairmovedownward.They’reabletosensewhat’sgoingonfromthebirdinfront,wherethis‘goodair’iscomingfromandnowhowtopositionthemselvesperfectlyinit,leadresearcherStevenPortugaltoldBBC.Infact,theVformationhaslongthoughttohelpbirdsflymoreefficiently(效率搞地).Apreviousstudyshowedthatbirds’heartrateswentdownwhentheywereflyingtogetherinaVformation.Jetfighterswerealsofoundtobeablereducetheirenergyusebyupto18%bystayingnearthewingtipsofotherjetfighters.BothofthesefindingsledscientiststosuspectthattheVformationhadanefficiencypurpose,butuntilnowtheystilllackproof.Forscientists,thenewstudyprovidesaninsightintoaninterestingnaturalphenomenon.Butitcouldmeanevenmoreforaircraftcompanieshelpingthemunderstandhowtheycanimitatethatwiththeirplaneformationstosavefuel,saidPortugal.小題1:Whatistheauthor’spurposeinwritingthisarticle?A.Toexplainhowbirdsbenefitfrommigration.B.Tointroducehowmigratingbirdsfindtheirway.C.Totellsomeapplicationsofmigratingbirds’Vformations.D.Toreportnewfindingsaboutmigratingbirds’Vformations.小題2:Accordingtotherecentstudy,whenbirdsmigrate.A.theydon’tchangetheirleadbirdsduringthewholejourneyB.theyflyinVformationstoprotectthemselvesagainstenemiesC.theyformtheshapeofaVtomakebestuseoftheliftingeffectD.theairtheystiraroundmakesithardforthebirdsbehindtoflyfast小題3:Whatisthesignificanceofthenewstudyaccordingtothisarticle?A.Itmightinspireaircraftcompaniestothinkofwaystoimproveefficiency.B.IthasprovedthattheVformationcanimproveinefficiencyinmanyfields,C.Ithasledscientiststodiscoverthatbirds’heartratesgodownwhentheyflyinaV.D.ItshowsthatthebestformationofjetfightersinbattleshouldbeaVformation.小題4:Theunderlinedwordimitateinthelastparagraphmostprobablymeans.A.useB.copyC.changeD.learn參考答案及解析小題1:D小題2:C小題3:A小題4:B本文介紹的是一項(xiàng)新的研究，是關(guān)于候鳥使用V字形飛行的原因。以此對(duì)我們的飛機(jī)制造有些啟發(fā)作用。小題1:D推理題。根據(jù)文章主題段第一段最后一句Now,aresearchgroupfromUniversityofLondonmayhavefoundtheanswer―migratingbirdsflyinaVtosaveenergy,accordingtoastudypublishedinthejournalNature.可知本文是對(duì)候鳥使用V字形飛行的原因的研究的新的發(fā)現(xiàn)。故D正確。小題2:C推理題。根據(jù)文章第三段Apartformthefreeridestrategy,scientistswerealsosurprisedtoobservethatmigratingbirdstimedtheirwingbeatsandadjustedtheirpositionsinaveryprecisewaytomaximizetheliftingeffectwhileavoidingareaswheretheairmovedownward.可知候鳥按照V字形飛行是為了更好地利用鳥兒拍打翅膀帶來的lifting的影響，讓飛行的效率更高。故C正確。小題3:A推理題。根據(jù)文章最后2行.Butitcouldmeanevenmoreforaircraftcompanieshelpingthemunderstandhowtheycanimitatethatwiththeirplaneformationstosavefuel,saidPortugal.可知飛機(jī)制造商可以利用這一研究結(jié)果來提高飛機(jī)飛行的效率。故A正確。小題4:B猜測(cè)詞義題。根據(jù)本句Butitcouldmeanevenmoreforaircraftcompanieshelpingthemunderstandhowtheycanimitatethatwiththeirplaneformationstosavefuel,saidPortugal.可知這一新發(fā)現(xiàn)能夠幫助那些飛機(jī)制造商，更好地理解他們?nèi)绾文７馒B兒的這一飛行特點(diǎn)來改造飛機(jī)以節(jié)省燃料。該該詞是指模仿，故B正確。Scientistshavebeenpuzzledbythephenomenonthatmigratingbirdsflynotjustingroupsallthetime,butinVformationsandtheyhavetriedtofigureoutwhatbenefitbirdsgetfromthisparticularformation.科學(xué)家對(duì)于這一現(xiàn)象感覺很困惑，候鳥飛行的時(shí)候不僅僅是一直都是一群鳥兒一起飛而且是按照V