2022年雅思阅读模拟试题:流程图题(3).pdf

2022年雅思阅读模拟试题:流程图题(3).pdf

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2022年雅思阅读模拟试题:流程图题(3)

Thehistoryofthetortoise

Ifyougobackfarenough,everythinglivedinthesea.At

variouspointsinevolutionaryhistory,enterprisingindividuals

withinmanydifferentanimalgroupsmovedoutontotheland,

sometimeseventothemostparcheddeserts,takingtheirownprivate

seawaterwiththeminbloodandcellularfluids.Inadditiontothe

reptiles,birds,mammalsandinsectswhichweseeallaroundus,

othergroupsthathavesucceededoutofwaterincludescorpions,

snails,crustaceanssuchaswoodliceandlandcrabs,millipedesand

centipedes,spidersandvariousworms.Andwemustn’tforgetthe

plants,withoutwhosepriorinvasionofthelandnoneoftheother

migrationscouldhavehappened.

Movingfromwatertolandinvolvedamajorredesignofevery

aspectoflife,includingbreathingandreproduction.Nevertheless,

agoodnumberofthoroughgoinglandanimalslaterturnedaround,

abandonedtheirhard-earnedterrestrialre-tooling,andreturned

tothewateragain.Sealshaveonlygonepartwayback.Theyshow

uswhattheintermediatesmighthavebeenlike,onthewaytoextreme

casessuchaswhalesanddugongs.Whales(includingthesmallwhales

wecalldolphins)anddugongs,withtheirclosecousinsthemanatees,

ceasedtobelandcreaturesaltogetherandrevertedtothefull

marinehabitsoftheirremoteancestors.Theydon’tevencomeashore

tobreed.Theydo,however,stillbreatheair,havingnever

developedanythingequivalenttothegillsoftheirearliermarine

incarnation.Turtleswentbacktotheseaaverylongtimeagoand,

likeallvertebratereturneestothewater,theybreatheair.

However,theyare,inonerespect,lessfullygivenbacktothewater

than

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