66. B 考查细节理解。该段的最后一句话告诉我们他们计划失败的原因：Then her husband lost his job，也就是B项所说的：The father was out of work。
67. D 考查细节理解。根据第三段中的"The Jacobs family did work out a solution: They asked and received more aid from the schools, and each son increased his borrowing to the maximum amount through the federal loan（贷款）program"，可知选D项。
68. A 考查细节理解。由第四段的第一句话可知，随着失业的增加，资金援助管理人员认为：很多家庭都有Jacobs家那样的情况。由此可知答案为A项。
69. C 考查细节理解。由倒数第二段中的最后两句可知，中产阶级不惜任何代价送他们的孩子上大学。由此可知C项正确。
70. D 考查细节理解。根据最后一段的最后一句话可知，政府将继续向大学生提供资金援助（go on providing financial support for college students）。