- 问题详情:Fiftyyearsago,zooswereplaceswherepeoplecouldgotoseeanimalsfrommanypartsoftheworld.Theanimalslivedincagesthatwereeasytokeepclean.However,fortheanimalsthecagesweresmallandimpossibletohidein.Althoughthezookeeperstookgoodcareofthem,manyoftheanima...
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