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.

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.