数学： 1 数列求和公式Sn=n(n+1)，a3=? 解答：很简单 求出S3和S2，S3-S2=a3 2 还有一个数列题，告诉了前两项（具体数字不记得了），说从第三项开始，每一项都是前面所有项的和，问得是a24/a20。 解答：这个数列后面就是一个公比为2的等比数列了，因此a24/a20=16 3）DS题，是一个集合题，告诉你一共40人，做A（已经抽象化了）的是15人，做B的是12人，求得是既不作A，又不作B的人数 1、A和B都做的人是10人 2、只做A和只做B和A和B都作的一共是17人 我选的是D 4) DS提，就是那道火车相遇时，那一辆到目的地更近 （前面的jj中有） 5）告诉你一个点的坐标，求该点到Y轴的距离。暴简单。 6）直角等腰三角形的面积已知，求周长。 RC 有一篇GWD中的原文（我的第一篇文章） In American Genesis, which covers the century of technological innovation in the United States beginning in 1876, Line Thomas Hughes assigns special promi- (5) nence to Thomas Edison as archetype of the independent nineteenth-century inventor. However, Hughes virtually ignores Edison’s famous contem- porary and notorious adversary in (10) the field of electric light and power, George Westinghouse. This com- parative neglect of Westinghouse is consistent with other recent historians’ works, although it marks an intriguing (15) departure from the prevailing view during the inventors’ lifetimes (and for decades afterward) of Edison and Westinghouse as the two “pioneer innovators ” of the electrical industry. (20) My recent reevaluation of Westing- house, facilitated by materials found in railroad archives, suggests that while Westinghouse and Edison shared important traits as inventors, they (25) differed markedly in their approach to the business aspects of innovation. For Edison as an inventor, novelty was always paramount: the overriding goal of the business of innovation was (30) simply to generate funding for new inventions. Edison therefore undertook just enough sales, product development, and manufacturing to accomplish this. Westinghouse, however, shared the (35) attitudes of the railroads and other industries for whom he developed innovations: product development standardization, system and order were top priorities. Westinghouse (40) thus better exemplifies the systematic approach to technological development that would become a hallmark of modern corporate research and development. 有一个是好像是原题： The primary purpose of the passage is to - reevaluate a controversial theory
- identify the flaws in a study
- propose a new method of historical research
- compare two contrasting analyses
- provide a fresh perspective （E）
还有一个题目是问与George Westinghouse同时代的人是怎么评价George Westinghouse的？
还有一个题目实在想不起来了。
SC，碰到了一道争议题：
20. GWD-30-Q20: Researchers have announced that the magnetic fields emitted by one manufacturer’s security surveillance system, of which type there are 200,000 worldwide, can interfere with pacemakers and that this interaction can bring on missed or irregular heartbeats, nausea, breathlessness, dizziness, and even fainting.
- of which type there are 200,000 worldwide, can interfere with pacemakers and that
- of which, worldwide, there are 200,000 of that type, and which can interfere with pacemakers, and
- of which type there are 200,000 worldwide, they can interfere with pacemakers and
- 200,000 of which type exist worldwide, interfering with pacemakers, and
- 200,000 of that type existing worldwide and can interfere with pacemakers, and
我选的是A，下面是我查看讨论后的总结： 正确答案是A，announced that X can interfere, and that Y can bring on - 句型工整对称，which type当作一个固定用法记下来，理解不了。 D有两处错误： 1) 没谓语 2) interfering present participle 在句中修饰surveillance system. 而句子逻辑上看应该是修饰emitted, 动作分出者应是magnetic fields.
AWA忘了，补上：
AA是：两个地区，有一个地区过去几年的commercial real estate的价格上涨了很多，而另一个地区stay the same。这两个地区之前的价格是一样的。因此，后一个地区commercial real estate有更高的上涨空间。我们应 该投资后一个地区。
AI是：随着全球合作的增加，我们更need to understand ... the role as a citizen of the world than as a citizen of a particular country. | 
