读真题及答案:PASSAGE16Thefirstflyingvertebratesweretruereptilesinwhichoneofthefingersofthefrontlimbsbecameveryelongated,,literallythe"wingedlizards."TheearliestpterosaursaroseneartheendoftheTriassicperiodoftheMesozoicEra,ur,,somethepterosaursbecamegigantic;thelargestfossildiscoveredisofanindividualthathadawingspanof50feetormore,,tooth-filledjaws,,notskillfulfliers,,monreptilianancestorswithpterosaurs,,themoreorlessparalleldevelopmentofdifferenttypesofbodystructureandfunctionforthesamereason—inthiscase,,asalways,pleteenoughtodeterminedefinitivelytheevolutionarylineageofthebirdsorinasmuchdetailasonewouldlike,,,haditnotbeenforthesuperbpreservationofthesefossils,,butinthel
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