1、ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
A、exhibition
B、concert
C、excursion
D、contest
2、Formulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.
A、emphaticallystated
B、belligerently(aggressively)argued
C、accentuated(emphasize)
D、entreated恳求（implore,plea,invoke）
3、Amythical(imaginary)creature,thedragonwasbelievedtohavelion'sclaws,scalyskin,andfierybreath.
A、legendary
B、magical
C、frightening
D、perplexing
4、Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
A、Previously
B、Strictly
C、Officially
D、Periodically
5、ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
A、migration
B、population
C、existence
D、evolution