单选题网络咖啡屋，或者是网吧目前在都市非常流行，不少专家觉得这是一个很好的服务方向，很有市场前景。但实际上，网络咖啡屋和网吧的经营遇到了很多闲难，其中之一就是电信部门网络服务基础收费太高，按照网络咖啡屋和网吧最初定的价格，就是加上酒水方面的利润，总体上也还是亏本。有些网络咖啡屋和网吧的经营者进行了量一本一利的计算后，准备全面提高网络服务和酒水的价格，来维持自身的生存和发展。 以下哪项如果为真，能有力地对上述措施提出质疑?

单选题Mayor Smith, one of our few government officials with a record of outspoken, informed, and consistent opposition to nuclear power plant construction projects, has now declared herself in favor of building the nuclear power plant at Littletown. If someone with her past antinuclear record now favors building this power plant, then there is good reason to believe that it will be safe and therefore should be built. The argument is vulnerable to criticism on which one of the following grounds?

单选题在一个物质过剩的世界里却有人因为物质短缺而死去，这种道德上的令人厌恶和智力上的荒谬愚蠢，令我感到震惊和羞耻。 下面哪一项是上面这句话的明显含义? A．在一个物质过剩的世界里，有人因物质短缺而死去，是因为他过于懒惰。 B．在一个物质过剩的世界里，有人因物质短缺而死去，是因为他过于愚蠢。 C．从道德和智力这两个层面而言，我们本来应该设计出一种分配制度，以便让每个社会成员都过上体面有尊严的生活。 D．在一个物质过剩的世界里，有人因物质短缺而死去，是因为他在性格上有缺陷。

单选题很多冷藏食品腐坏的原因是这些食品在冰箱搁板后面变坏却看不见。那么为何不使用能旋转的圆形搁板呢?因为圆形搁板的缺陷是搁板上的东西可能从搁板边上掉到后面的角落去。 在反对引入旋转搁板的论证中，下面哪个是被预先假定的?

单选题电冰箱的问世引起了冰市场的崩溃，以前人们用冰来保鲜食物，现在电冰箱替代了冰的作用。同样道理，由于生物工程的成果，研究出能抵抗害虫的农作物，则会引起什么后果? 以下哪项是上述问题的最好回答?

单选题地球两极地区所有的冰都是由降雪形成的。特别冷的空气不能保持很多的湿气，所以不能产生大量降雪。近年来，两极地区的空气无一例外地特别冷。 　　以上信息最有力地支持以下哪一个结论？

单选题有用的蛋白质药品，如胰岛素，仍然必须通过烦琐的皮下注射程序来予以实施。如果蛋白质被口服，它们就会被消化而不能到达目标细胞。但是，有些非蛋白质药物含有不会被消化系统分解的化学键。 以上的论述最强烈地支持了这样的论断，即一种成功实现下面______项研究计划可使蛋白质药品的使用者受益。

单选题《伊索寓言》中有这样一段文字：有一只狗习惯于吃鸡蛋。久而久之，它认为“一切鸡蛋都是圆的”。有一次，它看见一个圆圆的海螺，以为是鸡蛋，于是张开大嘴，一口就把海螺吞下肚去，结果肚子疼得直打滚。 狗误吃海螺是依据下述哪项判断的?

单选题下面哪一个县的颜色可以与W相同?( )

单选题根据大陆漂移假说，现在许多分离的陆地在史前时是一块巨大的陆地的一部分。由于地壳运动，这块陆地开始分裂。由这个理论可以猜想南美洲的东海岸原来跟非洲的西海岸是连在一起的。 以下哪个发现最能支持上述猜想?

单选题李惠的个子比胡戈高；张凤元的个子比邓元高；邓元的个子比陈小曼矮；胡戈和陈小曼的身高相同。 如果上述断定为真，以下哪项也一定为真?

单选题In the 1980 United States census, marital status was described under one of five categories: single, now married (but not separated), separated, divorced, widowed. In the category "separated," including both those who were legally separated and those who were estranged and living apart from their spouses, one million more women than men were counted. Which of the following, if true, provide(s) or contribute(s) to an explanation for this result? Ⅰ. There are more women of marriageable, age than men of marriageable age in the United States. Ⅱ. More of the separated men than separated women in the United States could not be found by the census takers during the census. Ⅲ. Many more separated men than separated women left the United States for residence in another country.

单选题Government department head: We already have a code of ethics that companies doing business with the department are urged to abide by. The fact that virtually all of the companies have agreed to abide by it indicates that it is successful. Therefore, neither stronger ethics regulations nor enforcement mechanisms are necessary to ensure ethical behavior by companies doing business with the department. Which of the following, if true, casts most doubt on the department head's conclusion? (A) The code of ethics applies only to companies that do business with the department. (B) The code of ethics was instituted only after it was discovered that several companies had committed serious violations of ethics in their business with the department. (C) A government investigation found that most of the companies that agreed to abide by the department's code of ethics are not complying with it. (D) A survey of major companies found that several companies stopped doing business with the department because they did not want to agree to abide by the code of ethics. (E) A study of codes of ethics for companies found that the codes are most effective when the top executives of companies that agree to abide by them are fully committed to following them.

单选题一位经济学家提出，把污染型工业从发达国家转移到发展中国家，发达国家因自然环境的改善而受益。发展中国家虽然环境受到污染，但在解决就业、增加税收等方面得到补偿。因此，双方的境遇都有所改善，从而全球的总福利得到增加。 以下哪项是这位经济学家论述的假设?

单选题淮州市的发展前景不容乐观，它的发展依赖于工业，工业为居民提供岗位和工资，而它的自然环境则取决于消除工业污染，工业污染危及空气、水和建筑。不幸的是，它的工业不可避免地产生污染。 如果以上所说都是真的，则它们最有力地支持下面哪项陈述?

单选题犯罪的人主要是年轻人，由于这个原因，仅仅增加警官的数量或者仅仅增加警察服务的开支对降低犯罪率效果很小。事实上，与犯罪率降低相关的唯一因素是社会上14～80岁的人的数量得以减少。 以上的发现能最好地作为哪种观点的部分反对意见?

单选题私有企业通过提供高薪来吸引具有较强能力的专业人才。这一措施导致的结果是，大多数受雇于私有企业的专业人才的收入比相同层次但在国有企事业单位工作的专业人才高出60%。所以，除非国有企事业单位雇用的专业人才更多的是被对公众和公益事业的责任感而不是个人利益所驱使，否则国有企事业单位有可能使它的相当一部分专业人才流失到私有企业，因为这些专业人才没有在私有企业中找不到工作的。 上述推理基于以下哪项假设?

单选题Scientists now believe that artificial-hip implants, previously thought to be safe, may actually increase the risk of cancer in recipients after about 45 years of use. Though these implants do improve the quality of recipients' lives, the increased risk of cancer is an unacceptable price to pay for these improvements. Therefore, they should be banned. Which of the following, if true, is the strongest counterargument to the argument above?

单选题The town of Greenfield recently instituted a substantial supplementary tax on all households, whereby each household is taxed in proportion to the volume of the trash that it puts out for trash collectors to pick up, as measured by the number of standard-sized garbage bags put out. In order to reduce the volume of the trash on which their tax bill is based, Greenfield households can deliver their recyclable trash to a conveniently located local commercial recycling center, where such trash is accepted free of charge. The supplementary tax provides some financial incentive to Greenfield households to do each of the following EXCEPT

单选题在一个标有R、S、W、X、Y、Z6个国家的地图上，相邻的国家不能是相同的颜色。相邻国家如下描述： (1)R、S、X、Y与W相邻。 (2)X与Y相邻。 (3)R和S与Z相邻。