They tried to prevail __ Mary to invest all her money in the project.
A．at
B．into
C．above
D．on

n＝156
（1)自然数n加上100是一个完全平方数
（2)自然数n加上168是一个完全平方数
A．条件（1)充分，但条件（2)不充分。
B．条件（2)充分，但条件（1)不充分。
C．条件（1)和（2)单独都不充分，但条件（1)和条件（2)联合起来充分。
D．条件（1)充分，条件（2)也充分。
E．条件（1)和（2)单独都不充分，条件（1)和条件（2)联合起来也不充分。

几年前，作为一个减少以橡树叶子为食的吉普赛蛾数量的方法，昆虫学家们在橡树林中引进了一种对吉普赛蛾有毒的真菌。从此那个地区的毛虫和成熟的吉普赛蛾的数量都显著下降。昆虫学家由此推论，有毒真菌的出现是导致毛虫和成熟的吉普赛蛾数量下降的原因。以下哪项如果为真，最能支持上述论证？
A．森林中引进真菌后，吉普赛蛾数目的减少量并不比目前同一时间内其他地区的减少量。
B．在过去的几年中，空气污染和酸雨是造成橡树数量大量减少的原因。
C．吉普赛毛虫和成虫数量的增加伴随着以它们为食的一些物种的数量的减少。
D．为控制吉普赛蛾而引进的有毒真菌除了对吉普赛蛾有毒外还对其他少数的几种昆虫有毒。
E．一种毛虫不受有毒真菌影响的吉普赛蛾的数量在整个吉普赛蛾中的比例在增加。

When the American economy was running full tilt two years ago, few places were as breathlessly delighted as Seattle. Its port was thronged with ships bringing goods from Asia. The Boeing Company could barely keep up with demand for its airliners. Microsoft was hiring hordes of software engineers. After each rain shower, another Internet millionaire sprang up. Here was a city that had it all--Old Economy, New Economy, Not-Yet-Invented Economy.
Now it has all gone sour. The past 12 months have been a non-stop succession of disappointments. Boeing's headquarters decamped to Chicago. The Internet economy popped alike a balloon in a nail factory, taking with it once promising local ventures such as Homegrocer.com and leaving can't-possibly-miss companies such as drugstore.com barely hanging on. And an already troubled Boeing was hit even harder after September 11th both by a steep drop in airliner orders and by losing a $ 200 billion Joint Strike Fighter contract to Lockheed Martin.
Washington State, battered by what is happening in Seattle, now has the highest unemployment rate in the United States--6.6% compared with 5.4% in the country as a whole. Right behind it is next-door Oregon, another former boom state, with 6.5% of its workforce out of a job, the country's second worst figure. In Oregon, manufacturing's collapse has caused the loss of nearly 30,000 jobs in a year, those hit range from Freightliner, a maker of heavy lorries, to high-tech companies such as Intel and Fujitsu.
What makes the current plunge so painful is that every part of the economy seems to have stepped into an open manhole at the same time. Three years ago, when Boeing began to remove more than 20,000 people that Boeing expects to lay off by the middle of 2002 have to compete with unemployed workers not just from the high-tech industry but from construction work and even the retail sector. Portland now has more jobless than the other parts of Oregon: the opposite of how things were years ago.
Even worse, the Pacific north west's downturn, as well as being deeper than the rest of the country, may also last longer. One reason for fearing this is Boeing's continuing woes. Nowadays Boeing accounts for less than 5% of employment in the Seattle area, down from 9% two decades ago. But it remains the foundation on which the rest is built. Its network of suppliers and subcontractors gives it a far stronger multiplier effect than, say, Microsoft, which is more an island of prosperity than a center of web. The chances are that Boeing will not really bounce back until the assumed revival in air travel persuades airline companies to start buying plenty of aircraft again. And that may not be until 2003.
The sentence "After each rain shower, another Internet millionaire sprang up" （Paragraph 1) means ______.
A．many people get rich quickly and easily with the New Economy
B．it takes only the time between showers for someone to become boss
C．Seattle's development is sudden like rain showers
D．Seattle has as many business millionaires as its rain showers

因为青少年缺乏基本的驾驶技巧，特别是缺乏紧急情况的应对能力，所以必须给青少年的驾驶执照附加限制。在这一点上，应当吸取H国的教训。在H国，法律规定16岁以上就可申请驾驶执照。尽管在该国注册的司机中19岁以下的只占7%，但他们却是20%的造成死亡的交通事故的肇事者。以下各项有关H国的判定如果为真，都能削弱上述议论，除了：
A．与其他人相比，青少年开的车较旧，性能也较差。
B．青少年开车时载客的人数比其他司机要多。
C．青少年开车的年均公里（即每年平均行驶的公里数)要高于其他司机。
D．和其他司机相比，青少年较不习惯系安全带。
E．据统计，被查出酒后开车的司机中，青少年所占的比例，远高于他们占整个司机总数的比例。

西式快餐业已被广大的中国消费者接受。随着美国快餐之父艾德熊的大踏步迈进并立足中国市场，一向生意火爆的麦当劳在中国的利润在今后几年肯定会有较明显的下降。要使上述推测成立，以下哪项必须假设？
Ⅰ．今后几年中，中国消费者用于西式快餐的消费总额不会有大的变化。
Ⅱ．今后几年中，中国消费者用于除麦当劳、艾德熊以外的西式快餐上的消费总额不会有大的变化。
Ⅲ．今后几年中，艾德熊的经营规模要达到和麦当劳相当。
A．仅Ⅰ。
B．仅Ⅱ。
C．仅Ⅲ。
D．仅Ⅰ和Ⅱ。
E．Ⅰ、Ⅱ和Ⅲ。