Modernzoosareverydifferentfromzoosbuiltfiftyyearsago.At...
问题详情：Modernzoosareverydifferentfromzoosbuiltfiftyyearsago.Atthattime,zooswereplaceswherepeoplecouldgotoseeanimalsfrommanypartsoftheworld.Theanimalslivedincageswithironbars,whichwereeasytokeepclean....