2013年12月英语六级阅读：仔细阅读1（沪江网校第二版）
56. B. Raising children is getting expensive.
57. C. Economic downturn.
58. A. Optimism for the future.
59. D. They don't rely on their children to support them in old age.
60. B. To advise couples to think twice before having children.
