30+家庭主妇20天650，感谢CDer，北美20日机经~~~

aivar

lz32岁，毕业10年没动过英文。跟老公移民美国，闲着无聊想读个mba。 基本没什么基础，去年7-8月做了og的语法，逻辑，后来忙活着代购。转眼2月发现没时间再复习了，马上到了deadline, 于是报了名开始复习，总共时间20天，阅读0基础。prep 在590. 所以lz的分数一是幸运，二是jj給力。

说这些是想鼓励那些跟我一样基础不好的童鞋，不到考完不要放弃，研究好jj，总有希望。

受恩于cd，尽自己所能回馈。如之前的cder所说，送人玫瑰，手留余香。谢谢为我们整理jj的各位大侠！！

20日北美jj:

数学，基本90%都是jj里面的，但是我不知道为什么是50，因为jj做了2遍，难题做了3遍，很确定答案。所以讨论稿 还需要进一步验证正确性。
比较迷惑的一道：
165.说有一个长方形纸围城一个圆柱体，给出圆柱的底边周长100（？）和高80，求长方形对角线（在圆柱体上看起来是一个螺线Spiral）--------这道题确实是说周长100，这样子就有派（圆周率，不会打字符，nnd）。所以最后问的是大约是多少，答案都是整数，尼玛我选了10，相当不确定！！
解：圆柱底边周长相当于长方形的长，圆柱的高是长方形的宽    直接用勾股定理求


1、ds题，有图，2个人，K和H分别用相同长的火柴搭正方形和三角形，k一开始用4根火柴棒搭了一个正方形，然后每次加3根搭一个正方形，h一开始用7根火柴搭了3个三角形，然后每次加2根搭一个三角形，假设k搭了m个正方形，h搭了n个三角形的时候2个人停止搭，问能否求出n（我选了E）-----题目有图，看了糊涂，赫赫，不过是原题~~
1）m=n
2）当k和h用的火柴数一样的时候

2、给图书馆门锁设四位密码，用1,2，3,4 四个数字设，共多少种方法。可以重复
应该是4*4*4*4=256


3、49. 抛物线y=g(x)=ax^2+bx+c是否与x轴有两个交点？ 我选了B
1) y=g(x)+4与x轴有两个交点
2) y=g(x-4)与x轴有两个交点

63.问x的绝对值+y的绝对值是否等于0-----d
（1）x的绝对值+2*y的绝对值=0
（2）2*x的绝对值+y的绝对值=0

V2  DS 见右图，角BAD=35度，角BDC=70度，问CD=AD？
  1. 三角形DBC是等腰三角形
  2.AB垂直BC





解：（1）DBC是等腰三角形，但不知道是哪两条边相等，无法判断，所以不充分！！
（2）角ABC=90°，角A=35°，所以角C=55°角BDC=70°，所以角DBC=55°=》 BD=CD    
角DBA=90-55=35   所以BD=AD=CD   充分！   选B



81.一个星期除去周末，有一个课程都要上课，每个课程需要7天上完，第一个课程周五开始，第三个周一上玩，于是第二个课程周二开始，下个周三上玩，第三个课程周四开始。。。问第18个课程结束的时候是星期几----周五

84.已知5%x=250，问65%x-40%x=?-------------英文表达的
答案：1250

85、(a-b-c)的绝对值-(a-b-c)>0? (DS)
   a.a>b>c
   b.a>0,b>0,c>0
   好像是这样，反正选E
89.a和b的合起来的一个什么值是这么算得：VaVb/(Va+Vb),已知A的V1,B的V2，C的2V2，问AB合起来的值与AC合起来的值的比
答案(V1+2V2)/(2V1+2V2)
148. 直线y=ax+b是否与x的负轴相交
  1) a＜0
  2) b＜0
 lz选C

153. b等于什么时，直线y=x²+bx+4与x轴无交点
1）-2
2）0
3）6
V2  y=x^2+n*x+4，在n取哪个值得时候，Y跟x轴没交点
I   0
II  2
III 6
答案：选I和II的
154. (5x²-35x-150)/(3x²-9x-30)=0注意!!!!!!!!!题目问的是the sum of 解，所以是7


155. 5个C什么discs的和3个taps 一共卖了107
4个C和5个t是109，求C还是T来着忘了==。。。不过不影响，都能求
解：5个C和3个t卖了107元，4个c和5个t卖了109元，问c和t各是多少钱？
列方程：5c+3t=107    4c+5t=109   解方程：c=16   t=9

169. PS：如图，大圆直径D，小圆直径d，D+d=3(D-d)/2,问阴影部分面积。选项都是用D-d表示的，楼主选8分之3π*(D-d)^2
169. PS：如图，大圆直径D，小圆直径d，D+d=3(D-d)/2,问阴影部分面积。选项都是用D-d表示的，楼主选8分之3π*(D-d)^2

173.整数X1，X2，X3，X4，X5 被5除余某数问哪个被5除也余它
I: X1+2，X2+2 X3+2 X4+2 X5+2
II: 2X1, 2X2 2X3 2X4 2X5
III: X1平方 X2平方 X3平方 X4平方 X5平方
179.（x-1）*（x+1）能否被24整除---------c
   条件1：x不能被3整除
   条件2：（x-1）能被2整除
182.P和S是两个指数，问PS²的factor有几个
选项有：3,4,5,6,7,
解：exponent指数    *S^2  的factor有（1+1）（2+1）=6个
数学先这些吧~~总之做好jj就ok了~~

阅读：lost city,这个我老公帮我删减了那篇英文原文，对我的帮助挺大的。我发在下面！还有美国员工保护法，墨西哥建筑，睡眠有利于遗忘。
我想说阅读jj真的太有帮助了。lz之前没看过阅读，报完名开始做gwd(其他也来不及做了)，阅读基本每套能对5道左右，几近崩溃。prep能错6道左右，因为lz一直在低分库，阅读到最后极其简单。所以完全寄希望jj.阅读jj我看了三四遍，带英文原文的都让我先生帮我翻译一下。每个题目都带回原文找一下，不管狗主的答案是什么，我都要想一下在原文会是什么样子。所以对阅读jj，我基本是可以背诵原话的。都说jj是把双刃剑，实力是王道，但是要是马上要上战场而实力真的太弱的，就开始磨剑吧。

逻辑：有好几道jj以及变体。

新的：明星的广告。人们都不在信任，因为觉得明星都不用那个广告产品。问削弱
我选：有个体育产品公司出钱让明星用自己的产品

12.Older doctors vs. younger doctors有项研究表明做手术的好的医生比做手术不好的医生，在年轻时更愿意打电视游戏。研究者猜测电子游戏可以很好的训练手眼的协调性，进而使得这些人长大后可以更好的完成手术。问一项哪一项搞清楚后，有助于解决这个疑问。
选项：1、是否那些做手术不好的医生因为手眼协调差，所以年轻时排斥玩电子游戏。
          2、这些玩游戏的医生要比玩游戏但不是医生的人手眼协调好。
     3、手术好的医生比手术不好的医生是否手眼协调性好-------我选了这个

47.Online job search
有一道是问这两个人的说法是以什么为焦点的？
A说有网络好，人们可以通过网络投简历找到好多工作。
B说有网络也不好，人力资源收到太多简历，所以不容易outstand.
我选的是：简历的outstand在找工作的时候有多么important.

55.Fruit fly
还有就是果树上有苍蝇 发现有某某ant 苍蝇就会少 农民伯伯决定引进ant 来治苍蝇 好像是问削弱
答案记不住，很偏~~


语法：估计我的语法很差，基本都是单复数什么的，没什么可说的，能记得的：
1、each 的独立主格 each 。。。 +动词+ed
2、同位语
3、3times greater than.../3 times as great as



作文：
ai：fuel resources are limit,所以international agreement 应该adopted to reduce。。。。。。
aa：人力资源部门负责公司profits 下降那个，自己找吧，赫赫

lost city ,英文有用的那几段：

One such revelation occurred in December 2000.An expedition mapping a submerged mountain known as the Atlantis Massif, midwaybetween Bermuda and the Canary Islands and half a mile under the surface of theNorth Atlantic, came across a pillar of white rock as tall as a 20-storybuilding rising from the sea¬floor. Using the remotely operated ArgoII vehicleand the manned submersible Alvin, scientists surveyed and sampled themysterious formation. Although time constraints limited their investigation toa single Alvin dive, the researchers were able to collect enough information todetermine that the white pillar was just one of several such structures in thearea that were emitting heated seawater. They had discovered a field of undersea hot springs theynamed the Lost City Hydrothermal Field. It was unlike anything seen before, includingthe now famous black smokers.
Strange Chemistry
Scientists have known about underseahydrothermal ventssince the 1970s. The black smoker systems are the most familiar; they occur atmid-ocean ridges—those strings of volcanoes overlying spots where tectonicplates are pulling away from one another. The water at these vents can reachtemperatures above 400 degrees Celsius because of their proximity to moltenrock. With a pH similar to lemon juice, the scorching water leaches sulfide,iron, copper and zinc as it filters through the volcanic rocks below theseafloor. As this hot,acidic fluid then rises back to the surface of the seafloor, it is discharged through the ventsinto cold seawater,where the dissolved metal sulfides quickly cool and precipitate out of thefluid, producing a cloudy mix that looks like billowing black smoke. These metal sulfidesaccumulate into ever taller chimneys atop the vents. Despite their hostilechemistry, the areas surrounding these vents teem with exotic animals, such as giant, red-tippedRiftia tube worms, which lack both mouths and guts but thrive by a symbioticassociation with internal bacteria that consume poisonous hydrogen sulfide gasemanating from the vents.
Compared with the savage black smokerenvironment, the Lost City vents are eerily tranquil.安静 Locatedabout 15 kilometers to the west of the tectonic plate boundary at theMid-Atlantic Ridge, this vent field atop the Atlantis Massif is too distant forrising magma to heat the fluids to the blistering temperatures found at blacksmokers. Instead the water is heated by circulation through the merely warmrock below, and the highest measured temperature is only 90 degrees C. Neither arethe Lost City fluids acidic. They are alkaline, with a pH between 9 and 11—similar to milk ofmagnesia or household ammonia solution. Because these waters cannot readilydissolve high concentrations of metals such as iron and zinc, Lost City does not produce themetal sulfideplumes that characterize black smokers. Rather Lost City vent waters are richin calcium, which on mixing with seawater produces calcium carbonate (limestone). Thislimestone forms giant whitechimneys, the largest of which towers nearly 60 meters above thesea¬floor—significantlytaller than the loftiest black smoker chimney.
Hydrogen is full of energy as a consequence of its ability to transfer electrons to othercompounds, such as oxygen, releasing energy in the process. Compoundsthat can readily donate electrons to other compounds are described somewhatconfusingly as “chemically reduced.” Scientists have long suspected that reduced gases played animportant role in the origin of life on Earth. In the 1920s Russian biochemistAlexander Oparin and British evolutionary biologist J.B.S. Haldane eachsuggested that the primitive atmosphere of Earth might have been very rich inreduced gases such as methane, ammonia and hydrogen. If the atmosphere had highconcentrations of these gases, they proposed, the chemical ingredients required for life might haveformed spontaneously.
Lost City is a natural laboratory for testingthese ideas. In 2008 chemist Giora Proskurow¬ski of the Woods HoleOceanographic Institution and his colleagues published a paper in the journalScience demonstrating that the hydrothermal fluids at Lost City do indeedcontain small organic compounds such as methane, ethane and propane. Other worksuggests that the reactions at Lost City also produce small organic acids suchas formate and acetate. Together these findings confirm that the reducedconditions at the Lost City vents could support the types of chemical reactionsnecessary to create organic compounds from inorganic compounds—a simple butcritical step in prebiotic chemistry.
The findings from Lost City also bolsterhypotheses about where else in our solar system life might exist or haveexisted in the past. Any planet or moon containing both peridotite and liquid water—theingredients necessary for serpentinization—could conceivablysupport life-forms analogous to microbes at Lost City. Evidence ofthese components is strongest on Mars and on Jupiter’s moon Europa. Indeed,researchers have already detected methane in the modern Martian atmosphere.Whether it comes from microbes or chemical reactions in the planet’s rocks—orboth—remains uncertain, however

梦离ouzi

恭喜楼主···你老公肯定开心。

miss绿光

有个英文顶呱呱的老公真好!
有个有好JJ分享给大家的CDer真好！
谢谢你的lost city啦!
ヾ(＠⌒ー⌒＠)ノ

yuyyyan

lost city tai geili la !!!!
thanks~~~

zgloria

你太厉害了，我扎扎实实复习了三个月，结果才考了590。准备下个月再考，可是现在患有严重的看Gmat障碍症，根本看不进去书，纠结死了。。。。。

aivar

更新了一些自己能记得住的jj，希望能有所帮助。

此外，真的感谢我的老公~~

jadezhangweiyu

89.a和b的合起来的一个什么值是这么算得：VaVb/(Va+Vb),已知A的V1,B的V2，C的2V2，问AB合起来的值与AC合起来的值的比
答案(V1+2V2)/(2V1+2V2)
 请教一下，这个怎么算的啊，我数学功底很差

aivar

AB=vavb/(va+vb)=v1v2/(v1+v2)
AC=vavc/(va+vc)=v12v2/(v1+2v2)
两个一比，上面那个答案是我copy机经的，自己再算一下，那个未必对

liujaney2003

感谢楼主的lost city原文啊！