相關Modernzoosareverydif的文學知識

問題詳情：Modernzoosareverydifferentfromzoosbuiltfiftyyearsago.Atthattime,zooswereplaceswherepeoplecouldgotoseeanimalsfrommanypartsoftheworld.Theanimalslivedincageswithironbars,whichwereeasytokeepclean....