不可能所有的花都结果。以下哪项断定的含义，与上述断定最为接近？（)
A．可能所有的花都不结果。
B．可能有的花不结果。
C．可能有的花结果。
D．必然有的花不结果。
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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 -
大多数地理学家相信，石油是埋在古代海洋下面的有机物所产生的碳氧化合物的化学转化物。与之不同，有人假设石油实际上产生于在地球内分离的其他复杂的碳氢化合物上面的细菌活动。众所周知，这些碳氢化合物的规模超过了被埋有机物的规模。所以，我们的石油储备要多于大多数地理学家所认为的。下面哪个如果正确，对以上关于他们的石油储备的论证提供了最强有力的支持？（)
A．大多数地理学家对地球的石油储备持乐观态度。
B．大多数地理学家已经对以往发现石油储备进行了精确的化学分析。
C．古代的海洋在许多地方被埋到地里了，那里的化石非常丰富。
D．化学变化减少了来自有机物质被埋碳氢化合物的规模，减少的比例与细菌活动对其他复杂碳氢化合物的规模的减少比例大致相同。 -
获得奥斯卡大奖的影片《泰坦尼克号》在滨州上映，滨州独家经营权给了滨州电影发行放映公司。公司各部门可忙坏了，宣传部投入了史无前例的170万元进行各种形式的宣传，业务部组织了8家大影院超前放映和加长档期，财务部具体实施与各影院的收入分账，最终几乎全市的老百姓都去看了这部片子，公司赚了750万元。而公司在总结此项工作时却批评了宣传部此次工作中的失误。以下哪项如果为真，最能合理地解释上述情况？
A．公司宣传部没有事先跟其他部门沟通，宣传中缺少针对性。
B．由于忽视了奥斯卡获奖片自身具有免费宣传效应，公司宣传部的投入事实上过大。
C．公司宣传部的投入力度不足，《泰坦尼克号》在滨海上映时，滨海公司宣传投入了300万元。
D．公司宣传部的宣传在创意和形式上没有新的突破。 -
在近代科技发展中，技术革新从发明、应用到推广的循环过程不断加快。世界经济的繁荣是建立在导致新产业诞生的连续不断的技术革新上的。因此，产业界须要增加科研投入以促进经济进一步持续发展。上述论证基于以下哪项假设？（)
Ⅰ．科研成果能够产生一系列新技术、新发明。
Ⅱ．电信、生物制药、环保是目前技术革新循环最快的产业，将会在未来几年中产生大量的新技术、新发明。
Ⅲ．目前产业界投入科研的资金量还不足以确保一系列新技术，新发明的产生。
A．仅Ⅰ。
B．仅Ⅲ。
C．Ⅰ和Ⅱ。
D．Ⅰ和Ⅲ。 -
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。