在英语越来越重要的21世纪，每个大学生都渴望能掌握流利的英语。为帮助大家学到权威的英语知识，特提供以下资料：
56. Supporters of the Star Wars defense system hope that this would not only protect a nation against an actual nuclear attack, but would be enough of a threat to keep a nuclear war from ever happening.
56、星球大战防御系统的支持者们希望它不仅能保护一个遭受核攻击的国家，也希望它能成为使核攻击永不发生的足够威胁。
57. Neither would it prevent cruise missiles or bombers, whose flights are within the Earth's atmosphere, from hitting their targets.
57、它也不能防止轨道在地球大气层以内的洲际导弹和轰炸机命中目标。
58. Civil rights activists have long argued that one of the principal reasons why Blacks, Hispanics, and other minority groups have difficulty establishing themselves in business is that they lack access to the sizable orders and subcontracts that are generated by large companies.
58、人民活动家一直认为黑人和拉丁美人难以在生意上立足的原因是因为他们难以取得大公司的大宗定单和分包合同。
59. During the nineteenth century, she argues, the concept of the "useful" child who contributed to the family economy gave way gradually to the present day notion of the "useless" child who, though producing no income for, and indeed extremely costly to its parents, is yet considered emotionally "priceless".
59、她认为十九世纪给家庭经济作出贡献的孩子才“有用”的概念慢慢改变了，今天提到那些没有挣取收入的“无用”孩子，甚至还要花销很多，仍然在情感上被认为是无价的。
60. Well established among segments of the middle and upper classes by the mid-1800's, this new view of childhood spread throughout society in the late nineteenth and early twentieth centuries as reformers introduced child labor regulations and compulsory education laws predicted in part on the assumption that a child's emotional value made child labor taboo.
60、这种关于孩子的观点到19世纪时已在中上阶级中建立，并于19世纪末20世纪初在社会上广泛传播，当时改革者们推行童工规定和义务教育法，部分来源于孩子的情感价值的假设，这都使得使用童工被禁止了。
61. Of course, it would be as dangerous to overreact to history by concluding that the majority must now be wrong about expansion as it would be to re-enact the response that greeted the suggestion that the continents had drifted.
61、当然，对历史反应过度以致结论说关于扩张的问题大多数人都错了与重新形成对大陆漂浮建议理论的反应一样，是危险的。将来对于这些关键问题的研究毫无疑问是必要的，然而不应该否定最近研究结论的说服力，在18世纪的英格兰对于一些微不足道和有使用价值的商品和服务的需求，预示了我们今天的世界。
62. While the fact of this consumer revolution is hardly in doubt, three key questions remain: who were the consumers? What were their motives? And what were the effect of the new demand for luxuries?
62、然而这种消费革命的情况还有疑问，三个关键的问题是：消费者是什么人?他们的动机是什么?对于奢侈品的新型需求的效果是什么?
63. Although it has been possible to infer from the goods and services actually produced what manufacturers and servicing trades thought their customers wanted, only a study of relevant personal documents written by actual consumers will provide a precise picture of who wanted what.
63、尽管从生产厂商和服务行业认为他们的顾客需要并实际生产的产品或者提供的服务来推断他是可能的。但只有对实际的消费者填写的个人资料的研究才能清楚地描述顾客的需求。
64. With respect to their reasons for immigrating, Grassy does not deny their frequently noted fact that some of the immigrants of the 1630's, most notably the organizers and clergy, advanced religious explanations for departure, but he finds that such explanations usually assumed primacy only in retrospect.
64、对于他们移民原因的细节，Grassy并不否认他们经常提出的事实-17世纪30年代的一些移民主要由组织家和牧师组成，提出了要离开的宗教解释，但他发现只是以回顾的方式推定的基本情况。
65. If we take the age-and sex-specific unemployment rates that existed in 1956 (when the overall unemployment rate was 4.1 percent) and weight them by the age — and sex-specific shares of the labor force that prevail currently, the overall unemployment rate becomes 5 percent.
65、如果我们将1956年(当时的平均失业率为4、1%)的年龄和性别失业率分来用今天一般的劳动力中年龄性别比来计算的话，平均失业率就是5%了。