四级阅读仔细阅读1（第二版）答案
56. C. They love what they do and choose not to retire.
57. A. Neither of them is subject to forced retirement.
58. D. Working at an advanced age lengthens people's life.
59. C. It is a compensation for one's life-long hard work.
60. D. They prevent young people from getting ahead.
【牛】2天记住4000单词的秘密 【超值】5.5元一节课，注册即可免费试听