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56. B – Well-educated people tend to work longer.
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.
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.

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