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　　Passage One

　　56. D – People with no college degree do not easily find work.

　　57. B – A rapid technological advance

　　58. A – Economic growth will slow down

　　59. C – Even wealthy people must work longer to live comfortably in retirement.

　　60. D – Skills are highly valued regardless of age.

　Passage Two

　　61. C – The decline of the grain yield growth.

　　62. A – Their self-sufficiency is vital to the stability of world food markets.

　　63. D – They force more on the increase of animal feed than food grains.

　　64. D – The world will be able to feed its population without increasing farmland.

　　65. B – It is based on a doubtful assumption.