最近几年，外科医生数量的增长超过了外科手术数量的增长，而许多原来必须施行的外科手术现在又可以代之以内科治疗，这样，最近几年，每个外科医生每年所做的手术的数量平均下降了1/4。如果这种趋势得不到扭转，那么，外科手术的普遍质量和水平将不可避免地降低。上述论证基于以下哪项假设？
A．一个外科医生不可能保持他的手术水平，除非他每年所做手术的数量不低于一个起码的标准。
B．新上任的外科医生的手术水平普遍低于已在任的外科医生。
C．最近几年，外科手术的数量逐年减少。
D．最近几年，外科手术的平均质量和水平下降了。
相关问题推荐
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To an advertiser, which one should they pay more attention to？
A．Understanding of a language.
B．Ability to speak a language.
C．Obvious differences between languages.
D．The different idiomatic expressions between languages. -
下列加点的虚词使用正确的一句是__。
A．特异功能是否存在？超自然现象的背后是真理还是谎言？这些问题都需要进行科学的研究、认真的探讨。
B．老教授对古籍书店的负责人说：“这些古书陪伴了我50年，倒不是为了缺钱用，而是想给它们找到更年轻的读者。”
C．我愿意跟你们谈谈我在文学创作方面曾经走过的弯路，以免你们少付出一些不必要的代价。
D．近年来，我国经济建设和文化建设不断发展，但是，与此同时，在城市，甚至在农村，封建迷信也在死灰复燃。 -
Since the matter was extremely ______, we dealt with it immediately.
A．tough
B．tense
C．urgent
D．instant -
The rise of multinational corporations（跨国公司), global marketing, new communications technologies, and shrinking cultural differences have led to an unparalleled increase in global public relations or PR.
Surprisingly, since modem PR was largely an American invention, the U.S. leadership in public relations is being threatened by PR efforts in other countries. Ten years ago, for example, the world's top five public relations agencies were American-owned. In 1991, only one was. The British in particular are becoming more sophisticated and creative. A recent survey found that more than half of all British companies include PR as part of their corporate（公司的) planning activities, compared to about one-third of U.S. companies. It may not be long before London replaces New York as the capital of PR.
Why is America lagging behind in the global PR race？ First, Americans as a whole tend to be fairly provincial and take more of an interest in local affairs. Knowledge of world geography, for example, has never been strong in this country. Secondly, Americans lag behind their European and Asian counterparts（相对应的人) in knowing a second language. Less than 5 percent of Burson-Marshall's U.S. employees know two languages. Ogilvy and Mather has about the same percentage. Conversely, some European firms have half or more of their employees fluent in a second language. Finally, people involved in PR abroad tend to keep a closer eye on international affairs. In the financial PR area, for instance, most Americans read the Wall Street Journal. Overseas, their counterparts read the Journal as well as the Financial Times of London and The Economist, publications not often read in this country.
Perhaps the PR industry might take a lesson from Ted Turner of CNN（Cable News Network). Turner recently announced that the word "foreign" would no longer be used on CNN news broadcasts. According to Turner, global communications have made the nations of the world so interdependent that there is no longer any such thing as foreign.
According to the passage, U.S. leadership in public relations is being threatened because
A．an unparalleled increase in the number of public relations companies
B．shrinking cultural differences and new communications technologies
C．the decreasing number of multinational corporations in the U.S.
D．increased efforts of other countries in public relations -
某海滨城市医疗机构对最近20年的资料进行了统计分析，结果让他们大吃一惊：在他们这个历史上的癌症低发区，最近20年因癌症死亡的人数比例已高出全国城市平均值两倍。他们惊呼，本市最近20年来对癌症的防治方面出现了不小的失误。以下哪项，如果是真的，最能削弱上述论证？
A．该市市政府很重视癌症的防治工作，每年都会就癌症的防治问题召开专门工作会议，作出一年的工作安排。
B．最近20年来，本市在医疗保健方面的投入连年上升，医疗设施有了极大的改善。
C．该市各大医院、疗养院、医学院在运用中医治疗癌症方面，有不少理论进展和实践经验。
D．该市风景秀丽，气候宜人，适合疗养，全国很多晚期癌症病人云集在此，度过生命的最后一段日子。