請根據選文內容，從文章中選出兩個單詞，分別填入下列句子空格，並視句型結構需要作適 當的字形變化，使句子語意完整、語法正確，且符合全文文意。每格限填一個單詞（word）。 （填充，4分） Modern zoos serve the purposes of conserving endangered species as well as visitors. However, some people are against zoos because the animals there will lose the freedom they enjoy in the wild