英语阅读题Intheevolutionofmammalsfr-查字典问答网
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  英语阅读题Intheevolutionofmammalsfromreptiles(爬行动物),therewasasuccessionofphysicalchanges:thedevelopmentofwarmblood,bodyhairinsteadofscales,andthebeginningofthenursingoftheyoung.Thisradicalphysicaltrans

  英语阅读题

  Intheevolutionofmammalsfromreptiles(爬行动物),therewasasuccessionofphysicalchanges:thedevelopmentofwarmblood,bodyhairinsteadofscales,andthebeginningofthenursingoftheyoung.Thisradicalphysicaltransformationprovidedmammalswithagreatertoleranceforexternaltemperatureandrequiredrelianceonspecializedfoodtypes.Whenthedominantdinosaurs(恐龙)becameextinct,theAgeofMammalsbegan.Fortherest60millionyearsmammalsexpandedintothebiologicalvacuumwhichtheywerebetterequippedtoexploitthanallbutafewvarietiesofreptiles.

  Thehabitatoflifeformsonearthhasbeentheentireplanet,convenientlydividingtheworldintothebirdsoftheair,thefishofthesea,andthecreaturesoftheland.Theevolutionaryprocessalsocreatedsea-dwellingmammalswhoappearedtoreversetheprocessofevolutionastheyreturnedtothesea.Thewhales’limbsbecameflipperlike,andtheylostthehairontheirbodies,suitingthembettertoaquaticlife.

  Ontheotherhand,inthecourseoftheevolutionofbirdsfromreptiles,therewasasuccessionofchangesinthebone,muscle,andskinstructuresoftheanimals.Thiswholesalerestructuringofsomereptilesoveraperiodofthousandsofyearsequippedthenewanimalstoescapetheirpredatorsandtofindfoodmoreeasily.Buttheevolutionaryprocessdidnotstopthere.Onceadaptedtoflight,somebirdscontinuedtochangeandtheprocessseemedtoreverseitself.Aspenguins(企鹅)adaptedtomarinelife,theirwingschangedtoflippersandtheirfeatherstoawaterproofcovering,thussuitingthebirdsforasemi-aquaticexistence.

  1.TheAgeofMammalsbeganwhen____

  A.animalsevolvedfromreptiles

  B.animalsnursedtheyoung

  C.animalsweremoretoleranttoexternaltemperature

  D.thedominantdinosaursdiedout

  2.Itcanbeconcludedfromthispassagethattheancestorsofwhales____

  A.werefishB.chasedreptiles

  C.livedonthelandD.hadtoomanyoffspring

  3Inparagraph2,theword‘aquatic’isclosestinmeaningto____

  A.ofearthB.ofland

  C.ofriverD.ofwater

  4.Certainreptilesgraduallybecameabletoescapequicklyby____.

  A.acquiringnewstru

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2020-06-10 01:46
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陆卫

  DCBAA

2020-06-10 01:49:11

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