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Scientistshavebeenpuzzledbythephenomenonthatmigratingbirdsflynotjustingroupsallthetimebutin"V"formationsandtheyhavetriedtofigureoutwhatbenefitbirdsgetfromthisparticularformation.Nowaresearchgroupfro
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更新时间:2024-03-29 02:32:32
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Scientistshavebeenpuzzledbythephenomenonthatmigratingbirdsflynotjustingroupsallthetimebutin"V"formationsandtheyhavetriedtofigureoutwhatbenefitbirdsgetfromthisparticularformation.NowaresearchgroupfromUniversityofLondonmayhavefoundtheanswer―migratingbirdsflyina"V"tosaveenergyaccordingtoastudypublishedinthejournalNature.

Whenabirdflaps(振翅)itswingsitstirstheairarounditandcausesittomoveindifferentdirections.Scientistfoundinthestudythattheaircreatesanupward-movingwaveatthetipsofthewingswhichmeansthatifabirdfliesaroundthewingtipsofanotherbirditcangetaboost(抬高)fromtherisingairandthereforeuselessenergytostayintheair.

Apartformthe"freeride"strategyscientistswerealsosurprisedtoobservethatmigratingbirdstimedtheirwingbeatsandadjustedtheirpositionsinaveryprecisewaytomaximizetheliftingeffectwhileavoidingareaswheretheairmovedownward.

"They'reabletosensewhat'sgoingonfromthebirdinfrontwherethis'goodair'iscomingfromandnowhowtopositionthemselvesperfectlyinit"leadresearcherStevenPortugaltoldBBC.

Infactthe"V"formationhaslongthoughttohelpbirdsflymoreefficiently(效率搞地).Apreviousstudyshowedthatbirds'heartrateswentdownwhentheywereflyingtogetherina"V"formation.Jetfighterswerealsofoundtobeablereducetheirenergyusebyupto18%bystayingnearthewingtipsofotherjetfighters.Bothofthesefindingsledscientiststosuspectthatthe"V"formationhadanefficiencypurposebutuntilnowtheystilllackproof.

"Forscientiststhenewstudyprovidesaninsightintoaninterestingnaturalphenomenon.Butitcouldmeanevenmoreforaircraftcompanies—helpingthemunderstandhowtheycanimitatethatwiththeirplaneformationstosavefuelsaidPortugal."

小题1:Whatistheauthor'spurposeinwritingthisarticle?A.Toexplainhowbirdsbenefitfrommigration.B.Tointroducehowmigratingbirdsfindtheirway.C.Totellsomeapplicationsofmigratingbirds'"V"formations.D.Toreportnewfindingsaboutmigratingbirds'"V"formations.小题2:Accordingtotherecents

何潮观回答:
  小题1:D小题2:C小题3:A小题4:B本文介绍的是一项新的研究,是关于候鸟使用V字形飞行的原因。以此对我们的飞机制造有些启发作用。小题1:D   【试题解析】推理题。根据文章主题段第一段最后一句NowaresearchgroupfromUniversityofLondonmayhavefoundtheanswer―migratingbirdsflyina"V"tosaveenergyaccordingtoastudypublishedinthejournalNature.可知本文是对候鸟使用V字形飞行的原因的研究的新的发现。故D正确。小题2:C   【试题解析】推理题。根据文章第三段Apartformthe"freeride"strategyscientistswerealsosurprisedtoobservethatmigratingbirdstimedtheirwingbeatsandadjustedtheirpositionsinaveryprecisewaytomaximizetheliftingeffectwhileavoidingareaswheretheairmovedownward.可知候鸟按照V字形飞行是为了更好地利用鸟儿拍打翅膀带来的lifting的影响,让飞行的效率更高。故C正确。小题3:A   【试题解析】推理题。根据文章最后2行.Butitcouldmeanevenmoreforaircraftcompanies—helpingthemunderstandhowtheycanimitatethatwiththeirplaneformationstosavefuelsaidPortugal."可知飞机制造商可以利用这一研究结果来提高飞机飞行的效率。故A正确。小题4:B   【试题解析】猜测词义题。根据本句Butitcouldmeanevenmoreforaircraftcompanies—helpingthemunderstandhowtheycanimitatethatwiththeirplaneformationstosavefuelsaidPortugal."可知这一新发现能够帮助那些飞机制造商,更好地理解他们如何模仿鸟儿的这一飞行特点来改造飞机以节省燃料。该该词是指“模仿”,故B正确。   【长难句解析】Scientistshavebeenpuzzledbythephenomenonthatmigratingbirdsflynotjustingroupsallthetimebutin"V"formationsandtheyhavetriedtofigureoutwhatbenefitbirdsgetfromthisparticularformation.   【翻译】科学家对于这一现象感觉很困惑,候鸟飞行的时候不仅仅是一直都是一群鸟儿一起飞而且是按照V字形在飞行。他们一直都想知道从这种特殊的飞行模式中鸟儿能够得到什么样的好处。   【分析】本句中有一个同位语从句thatmigratingbirdsflynotjustingroupsallthetimebutin"V"formations,对前面的名词thephenomenon进行解释说明,that在这个同位语从句中不充当任何成分,只是一个引导词而已。同时动词figure后面还有一个由what引导的宾语从句,what在宾语从句中做主语。
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