Fiftyyearsago,zooswereplaceswherepeoplecouldgotoseeanim...
问题详情：Fiftyyearsago,zooswereplaceswherepeoplecouldgotoseeanimalsfrommanypartsoftheworld.Theanimalslivedincagesthatwereeasytokeepclean.However,fortheanimalsthecagesweresmallandimpossibletohidein.Alth...