ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
A、exhibitionEyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.
Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
Creamoftartar酒石,aweakacid,canbeaddedtoeggwhitestohelpthemfoam泡沫whentheyarebeaten
MaryMcCarthyssatires讽刺文学arecouchedinaprosestylethathasaclassicprecision.
Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.
