Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.
A、PreviouslyA
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Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainbiological,chemical,andphysicalcharacteristicsincommon.
Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
Blue－greenalgaegrowabundantlyinsaltmarshes.
ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
TheeconomyofDallas,Texas,isstronganddiversified.
