Modern zoos are very different from zoosthat were built fifty years ago. At that time， zoos were places 21 people could goto see animals from many parts of the world. The animals lived incages that were made 22 concrete withiron bars， cages that were easy to keep clean.
42. It was in the park where the boy used to play that we found the boy at last. 正是在这个孩子经常玩的那个公园里，我们终于找到了那个孩子。
position /pə'ziʃn/ n. 位置，职位，职务。predecessor /'pri:disesə/ n. 前任，原有的事物。premise /'premis/ n. 前提，假设。prescription /pri'skripʃn/ n. 处方。preservation /ˌprezə'veiʃn/ n. 保护，防护。prestige /pre'sti:ʒ/ n. 威信，威望。priority /prai'ɒrəti/ n. 优先。prospect /'prɒspekt/ n. 前景，可能性。
