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　　【四级阅读仔细阅读文章1】

　　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.

　　【四级阅读仔细阅读文章2】

　　61. A.Many young Americans will never be able to pay off their debts.

　　62. B.They haven't developed a credit history.

　　63. D. It will affect their future spending power.

　　64. B.They may experience a financial crisis in their old age.

　　65. C.Their clients leave their debts unpaid upon death.