The first important exposition in the United States was held in Philadelphia in 1876.
A、exhibitionA
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Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
WhileBillieHolidaydidnotinventthemusiccalled"theblues",shemostassuredlyhelpedpopularizeit.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.
Cometsarestillregardedwithawebysomepeople.
