2020年1月22日GRE数学机经预测
2020年1月10日GRE机经：GRE填空机经
2020年1月10日GRE机经：GRE填空机经骨头是一种生理上___ tissue：它能够根据身体在不同阶段的需要change size and shape.Although教授Pearson的同事经常抱怨他_____, 他的朋友quick to defend him from this charge of ____作者把book publishing描述为一个相当灰暗的hidebound industry, 面对着变革内部生产模式的深刻机遇 but is so____ its past as to be (ii)______ 科技变革所提供的际遇。
传统的Vietnamese文化长期promoted性别平等观点：founding myths ___ 父母在照顾孩子上的平等分工。
As is often the case, however, theoretical commitments are (ii) __ actual processes. 实际上，基于性别的___一直存有。
因为movie studios，在获取国际销量的压力下，have favoured 带有fantasy plots的大制作影片，那些代表着日常domestic life的内容has largely been_____ 其他媒体，如电视或者文学Well organized and researched并包含了所有重要的医学科学发现，这本《西方医学史》能够被justly called _____这个官员也许发现了解决当前财务困境的genuine resolution，但是她也许被引诱加入了一个欺骗中： a ____ exercise in fiscal prudence.过度强调汽车的安全性也许会带来一种____ effect：驾驶员会相信汽车的safety，从而在开车的时候更为不小心。
与我们的常识(蟑螂是一种非常tough resistance的动物)相反，它as____ as其他昆虫Chanel的小黑裙(即LBD)so____ that 每个女人都有一件。
2020年1月22日GRE填空机经预测
2020年1月22日GRE填空机经预测1. The cognitive flexibility of successful fictional detectives is often ____ by their cultural ambivalence：detectives' intellectual acumen, it seems, exists in direct proportion to their uneasy place in society.A. spurnedB. spadedC. spurredD. matchedE. emaciated答案：C解析：这道题的意思是说成功的侦探非常灵活，这是他们的文化矛盾所____：他们的社会地位越是动荡，他们就越发敏锐。
(a)唾弃(b)铲除(c)激励(d)匹配(e)消瘦。
我们通过后半句能够知道，是社会地位的动荡使得侦探日益敏锐和灵活，对应选项C中：spurred。
2. Professor Ramfield describes in his recent book publishing as dark as it is deep, even as one hidebound industry, indeed, it is facing a profound change in its product model, but is so (i)___ its past as to be(ii)____opportunities offered by technological change.Blank (i) Blank (ii)A. indebted in D. unable to seizeB. encumbered by E. capable of seekingC. irrelevant with F. definite to circumvent答案：BD解析：这道题是说Ramfield教授在书里描述说，呆板的产业正在面临产品模型的巨大改变，但是它们太过(i)____过去，以至于(ii)______科技改变带来的机会。
2020年1月22日GRE考试真题预测(GRE写作)
2020年1月22日GRE考试真题预测(GRE写作)ISSUE 篇10月30真题Scientists and other researchers should focus their research on areas that are likely to benefit the greatest number of people.10月17真题Scientists and other researchers should focus their research on areas that are likely to benefit the greatest number of people.9月20真题IC： People's behavior is largely determined by forces not oftheir own making9 月6 日真题Some people claim that the goal ofpolitics should be the pursuit of an ideal. Others argue that the goal shouldbe finding common ground and reaching reasonable consensus.Write a response in which you discusswhich view more closely aligns with your own position and explain yourreasoning for the position you take. In developing and supporting yourposition, you should address both of the views presented.8 月29 日真题The best way to understand the character of a society is to examine the character of the men and women that the society chooses as its heroes or its role models.8 月21 日真题18. The well-being of a society is enhanced when many of its people question authority?7 月10 日真题45. "Competition for high grades seriously limits the quality of learning at all levels of education."7 月5 日真题9. In any field of endeavor, it is impossible to make a significant contribution without first being strongly influenced by past achievements within that field.6 月28 日真题77. People's attitudes are determined more by their immediate situation or surroundings than by society as a whole.人的态度是由即时环境决定的还是社会整体环境决定的。
2020年新GRE数学考试学习策略：画图法
2020年新GRE数学考试学习策略：画图法GRE数学疑难问题之一1、关于一个地方的居民承诺捐款：要求的捐款数￥居民人数100 2058 3035 2010 10问，要求一个居住区的居民捐款，上表是居民承诺的捐款上限表，问：下列哪个钱，能够保证有半数以上(含)能够捐款。
I.35 II.54 III.21，问哪几个数字符合条件。
解答：如果设定捐款数是54，那么承诺捐款上限为100的20 个人和上限为58的30个人都会捐款，这样加起来就是50个人，居民总人数是20+30+20+10=80人，所以超过半数。
连54都能够，35、21就更能够。
所以理应全选。
2、学生总数240，学SCIENCE的是140，学MATH的170，求LEARN MATH BUT NOT SCIENCE的人数?1)THERE ARE 55 STUDENTS WHO LEARN SCIENCE BUT NOT MATH2)30 DIDN‘T SEL ECT ANY SUBJECT这种题有两种解题方法：1)、画图法画两个相交的圆A、B。
圆A下写学甲科的总数，圆B下写学乙科的总数;两圆相交的部分写两科都学的数量，不相交的部分写各自只学一门的数量。
再在外面画一个大方框，是学生总数，圆外方框内是什么都不学的。
这样就一目了然了。
2)、概念法P(A,B)=P(A)+P(B)-P(AB)以本题为例，至少学一科的=只学甲科+只学乙科-两科都学全集=A+B-A交B+非A非Bnormal distribution下One standard deviation away from the mean的possibility为68%，Two standard deviation away from the mean的possibility为95%，standard deviation = 10。
一种cougar的体长呈正态分布，均值60英寸，问体长在70到80英寸之间的概率?落在平均值标准方差内的概率possibility => (mean - deviation)60-1060-10*2只落在一边的概率就要除以二，基本上这种题画一条数轴，做几个点会更一目了然一些。
新gre机经：数学部分
新gre机经：数学部分1. 类似the smallest integer that satisfies x^2>65和8的比较，或者是能不能被什么除尽的余数之类，都需要需要注意这个integer是positive还是negative还是两者皆可- 绝对值 x y之差和之积，一元二次方程绝对值求解- shaded area和cirle面积相比注意是谁比谁大圆小圆直径看清楚- 公约数(出了道A的鞋是B的鞋的1/3 C的鞋是B的鞋的两倍C<30 问C的可能性)- 概率倒是没有考多少很简单有一道5个数在数轴上 3个2负取三个数都正的概率- 五边形内角和考了一下- 三角形两边之和与两边之差与第三边的关系- 统计图形要特别注意图下的* 有一道题这个*正好是被计算器挡住了我怎么算都算不对阿。
后来检查的时候把计算器挪开才发现。
当时内心感叹nice trick。
题目是逐年income per capita和revenue per capita之间各种ratio 后来提到college education revenue per capita is 2 times the secondary and primary education revenue 然后算一个college education revenue 和同年income per capita的比较我就是没有看到图下说revenue per capita here include only primary and secondary education...2. 数学出了几道分布和标准差的3. 出现了那个一个数列，12乘以前一个数的平方=下一个数问第5个数是12的几次4. 如图，一个等腰直角三角形(大的那个)面积是r，内切一个正方形，问1(图中左边那个小的)部分的三角型面积，答案是2/9r。
5.数轴上5个点，2个负的3个正的，问随机选3个，全正的概率。
2020年1月22日GRE考试真题预测(GRE逻辑)
2020年1月22日GRE考试真题预测(GRE逻辑)Each of two particular inspection systems that are based on different principles would detect all product flaws but would also erroneously reject three percent of flawless products.Assuming there is no overlap between the products erroneously rejected by the two systems and also no interference between the systems if both operate，using both systems and rejecting only those products found flawed by both would be a way of avoiding all erroneous rejections.Which of the following most precisely characterizes the reasoning in the argument?(A)The reasoning is conclusive，that is，the conclusion cannot be false if the statements offered in its support are true.(B)The reasoning is strong but not conclusive，if the statements offered in support of the conclusion are true，they provide good grounds for that conclu-sion，though it is possible that additional infor-mation might weaken the argument.(C)The reasoning is weak; the statements offered in support of the conclusion，though relevant to it，by themselves provide at best inadequate grounds for the conclusion.(D)The reasoning is flawed in that the conclusion is no more than a paraphrase of one of the pieces of evidence offered in its support.(E)The reasoning is flawed in that the argument treats evidence that a factor is necessary to bring about an event as if it were evidence that the factor is sufficient to bring about that event.In recent years，there has been a dramatic decline in the population of the shrike，a predatory bird that inhabits flat land，such as farms and pastures.Some ornithologists hypothesize that this decline is due to the introduction of new，more effective pesticides to control the insect species on which shrikes prey.The answer to which of the following questions is NOT relevant to evaluating the ornithologists' hypothesis?(A)Was there a decline in the shrike population before the new pesticides were first used?(B)Have shrike populations declined significantly in those habitats where the new pesticides have not been used?(C)Have the new pesticides more significantly reduced the population of insect species on which shrikes prey than did the pesticides previously used?(D)Are insects that have consumed the new pesti-cides more toxic to the shrikes that eat those insects than were insects that consumed the less effective pesticides?(E)Are the new pesticides considered by most people to be less harmful to the environment than the old pesticides were considered to be?Certain extremely harmful bacteria found only in sewage are difficult to detect directly.Testing for E.coli，aneasily detected and less harmful type of bacteria，in ocean water would be a reliable way of determining whether or not these more harmful bac-teria are present，since ocean water contains E.Coli only if the water is contaminated with sewage that contains the harmful bacteria.Which of the following，if true，most seriously weakens the argument?(A)There are many different strains of the E.coli bacteria，and only some of these strains are harmful.(B)Some types of bacteria found in sewage are neither disease-causing nor difficult to detect directly.(C)Some of the types of bacteria found in sewage along with E.coli are not harmful to people unless the bacteria are ingested in large quantities.(D)E.coli dies out much more quickly than some of the more harmful bacteria found in sewage and then can no longer be easily detected.(E)Some of the types of bacteria found in sewage along with E.coli reproduce at a slower rate than E.coliFor more than fifty years, many evolutionary biologists posited that early fish such as Eusthenopteron developed limbs as a result of the need to drag themselves across short distances when their watery habitats dried up during periods of drought. However, new fossil evidence suggests that this hypothesis is incorrect. Fossilized remains of Acanthostega, a primitive fish, reveal that even though the animal had rudimentary limbs, it could not walk on land. Acanthostegalacked ankles, which means that its limbs couldn’t s upport its weight; furthermore, its ribs were too short to prevent the organism’s chest cavity from collapsing once the animal left water.1. Which of the following would most strengthen the author’s argument?A. The fossilized remains of the Acanthostega are the earliest known evidence of early fish.B. The modem descendants of Acanthostega are not able to drag themselves across short distances on land.C. Biologists have found that some aquatic species can successfully drag themselves across land even though these species do not possess ankles.D. Any animal with a collapsed chest cavity is not able to survive long enough to travel even a short distance across land.E. Some evolutionary biologists believe that the new fossils are not from Acanthostega.答案：DAnaerobic glycolysis is a process in which energy is produced, without oxygen,through the breakdown of muscle glycogen into lactic acid and adenosinetriphosphate (ATP), the energy provider. The amount of energy that can beproduced anaerobically is a function of the amount of glycogen present—in allvertebrates about 0.5 percent of their muscles’ wet weight. Thus the anaerobicenergy reserves of a vertebrate are proportional to the size of the animal. If, forexample, some predators had attacked a 100-ton dinosaur, normally torpid, thedinosaur would have been able to generate almost instantaneously, viaanaerobic glycolysis, the energy of 3,000 humans at maximum oxidativemetabolic energy production.1. The passage‘s suggestion that the total anaerobic energy reserves of a vertebrate are proportional to the vertebrate‘s size is based on which of the following assumption?(A) larger vertebrates conserve more energy than smaller vertebrates(B) larger vertebrates use less oxygen per unit weight than smaller vertebrates(C) the ability of a vertebrate to consume food is a function of its size(D) the amount of muscle tissue in a vertebrate is directly related to its size(E) the size of a vertebrate is proportional to the quantity of energy it can utilize答案：E解析：文本是关于无氧糖酵解产生能量的这程，且提出动物体积越大，所产生的能量储备也就越多。
新GRE数学真题(OG+机经)
1.y=2x2+7x – 3x y2.The figure above shows the graph of a function f, defined by f(x)=|2x|+4 for all numbers x. For which of the following functions g defined for all numbers x does the graph of g intersect the graph of f ?A g(x) x–2B g(x) x 3C g(x) 2x – 2D g(x) 2x 3E g(x) 3x – 23.Each employee of a certain company is in either Department X or Department Y, and there are more than twice as many employees in Department X as in Department Y. The average (arithmetic mean) salaryis $25,000 for the employees in Department X and is $35,000 for the employees in Department Y. Which of the following amounts could be the average salary for all of the employees in the company?Indicate all such amounts.A $26,000B $28,000C $29,000D $30,000E $31,000F $32,000G $34,0004.Working alone at its constant rate, machine A produces k car parts in 10 minutes. Working alone at its constant rate, machine B produces k car partsin 15 minutes. How many minutes does it take machines A and B, working simultaneously at their respective constant rates, to produce k car parts?____________minutes5.1)If the dollar amount of sales at Store P was $800,000 for 2006, what was the dollar amount of sales at that store for 2008 ?A $727,200B $792,000C $800,000D $880,000E $968,0002)At Store T, the dollar amount of sales for 2007 was what percent of the dollar amount of sales for 2008 ?Give your answer to the nearest 0.1 percent.___________%3)Which of the following statements must be true?Indicate all such statements.A For 2008 the dollar amount of sales at Store R was greater than that at each of the other four stores.B The dollar amount of sales at Store S for 2008 was 22 percent lessthan that for 2006.C The dollar amount of sales at Store R for 2008 was more than 17 percent greater than that for 2006.6.A certain store sells two types of pens: one type for $2 per pen and the other type for $3 per pen. If a customer can spend up to $25 to buy pens at the store and there is no sales tax, what is the greatest number of pens the customer can buy?A 9B 10C 11D 12E 207.A list of numbers has a mean of 8 and a standard deviation of 2.5. If x is a number in the list that is 2 standard deviations above the mean, what is the value of x ?x=______8.Frequency Distribution for List XNumber 1 2 3 5Frequency 10 20 18 12Frequency Distribution for List YNumber 6 7 8 9Frequency 24 17 10 9List X and list Y each contain 60 numbers. Frequency distributions for each list are given above. The average (arithmetic mean) of the numbers in list X is 2.7, and the average of the numbers in list Y is 7.1. List Z contains 120 numbers: the 60 numbers in list X and the 60 numbers in list Y.Quantity A Quantity BThe average of the 120numbers in list Z The median of the 120 numbers in list Z 9.The figure above shows the graph of the function f in the xy-plane. What isthe value of f ( f (–1)) ?A –2B –1C 0D 1E 210.By weight, liquid A makes up 8 percent of solution R and 18 percent of solution S. If 3 grams of solution R are mixed with 7 grams of solution S, then liquid A accounts for what percent of the weight of the resulting solution?A 10%B 13%C 15%D 19%E 26%11.Of the 700 members of a certain organization, 120 are lawyers. Two members of the organization will be selected at random. Which of the following is closest to the probability that neither of the members selected will be a lawyer?A 0.5B 0.6C 0.7D 0.8E 0.912.Line k lies in the xy-plane. The x-intercept of line k is –4, and line k passes through the midpoint of the line segment whose endpoints are (2, 9) and (2, 0). What is the slope of line k ?Give your answer as a fraction._______13.In the course of an experiment, 95 measurements were recorded, and all of the measurements were integers. The 95 measurements were then grouped into 7 measurement intervals. The graph above shows the frequency distribution of the 95 measurements by measurement interval.Quantity A Quantity BThe average (arithmetic The median of the 95mean) of the 95 measurementsMeasurements14.The random variable X is normally distributed. The values 650 and 850 are at the 60th and 90th percentiles of the distribution of X, respectively.Quantity A Quantity BThe value at the 75th750percentile of thedistribution of X15.If 1+x+x2+x3=60, then the average (arithmetic mean) of x, x2, x3, andx4 is equal to which of the following?A 12xB 15xC 20xD 30xE 60x16.Parallelogram OPQR lies in the xy-plane, as shown in the figure above. The coordinates of point P are (2, 4) and the coordinates of point Q are (8, 6).What are the coordinates of point R ?A (3, 2)B (3, 3)C (4, 4)D (5, 2)E (6, 2)17.Let S be the set of all positive integers n such that n2 is a multiple of both24 and 108. Which of the following integers are divisors of every integer nin S ?Indicate all such integers.A 12B 24C 36D 7218.The range of the heights of the female students in a certain class is 13.2 inches, and the range of the heights of the male students in the class is 15.4inches.Which of the following statements individually provide(s) sufficient additional information to determine the range of the heights of all the students in the class? Indicate all such statements.A The tallest male student in the class is 5.8 inches taller than the tallest female student in the class.B The median height of the male students in the class is 1.1 inches greater than the median height of the female students in the class.C The average (arithmetic mean) height of the male students in the class is 4.6 inches greater than the average height of the female students in the class.19.A random variable Y is normally distributed with a mean of 200 and a standarddeviation of 10.Quantity A Quantity BThe probability of the event 1/6that the value of Y isgreater than 22020.In a graduating class of 236 students, 142 took algebra and 121 took chemistry. What is the greatest possible number of students that could have taken bothalgebra and chemistry?__________students21.The total amount that Mary paid for a book was equal to the price of the book plusa sales tax that was 4 percent of the price of the book. Mary paid for the book with a $10 bill and received the correct change, which was less than $3.00. Which of the following statements must be true?Indicate all such statements.A The price of the book was less than $9.50.B The price of the book was greater than $6.90.C The sales tax was less than $0.45.22.Which of the following statements individually provide(s) sufficient additional information to determine the area of triangle ABC above? Indicate all such statements.A DBC is an equilateral triangle.B ABD is an isosceles triangle.C The length of BC is equal to the length of AD.D The length of BC is 10.E The length of AD is 1023.The fabric needed to make 3 curtains sells for $8.00 per yard and can be purchased only by the full yard. If the length of fabric required for eachcurtain is 1.6 yards and all of the fabric is purchased as a single length,what is the total cost of the fabric that needs to be purchased for the 3curtains?A $40.00B $38.40C $24.00D $16.00E $12.8024.The fabric needed to make 3 curtains sells for $8.00 per yard and can bepurchased only by the full yard. If the length of fabric required for each curtain is 1.6 yards and all of the fabric is purchased as a single length,what is the total cost of the fabric that needs to be purchased for the 3 curtains?A $40.00B $38.40C $24.00D $16.00E $12.8025.In the xy-plane, the point with coordinates (–6, –7) is the center of circle C. The point with coordinates (–6, 5) lies inside C, and the point with coordinates (8, –7) lies outside C. If m is the radius of C and m is an integer, what is the value of m ?m =_____26.What is the least positive integer that is not a factor of 25! and is not a prime number?A 26B 28C 36D 56E 5827If 1 is expressed as a terminating decimal, how many nonzero digits1/[(211)(517)]will the decimal have?A OneB TwoC FourD SixE Eleven28.Eight hundred insects were weighed, and the resulting measurements, in milligrams, are summarized in the boxplot below.(a) What are the range, the three quartiles, and the interquartile range of the measurements?(b) If the 80th percentile of the measurements is 130 milligrams, about how many measurements are between 126 milligrams and 130 milligrams?29.The figure shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution corresponding to the six regions shown.Suppose the heights of a population of 3,000 adult penguins are approximately normally distributed with a mean of 65 centimeters and a standard deviation of 5 centimeters.(a) Approximately how many of the adult penguins are between 65 centimeters and 75 centimeters tall?(b) If an adult penguin is chosen at random from the population, approximately what is the probability that the penguin’s height will be less than 60 centimeters? Give your answer to the nearest 0.05机经题：8月5选11. 3个数的平均数是30，把这3个数翻倍之后也加在这个list中。
新Gre易错数学题即相关机经汇总
新Gre易错数学题即相关机经汇总易错题与机经汇总1. n个数从⼩到⼤排列，求（n-1）/4，设商为i，余数为j ，则可求得1st Quartile为：（第i+1个数）*（4-j）/4+（第i+2个数）*j/42. 4个*，2个·的排列⽅式15（=）3 .5双袜⼦，同时去2只，刚好配对的概率。
1/94. 40⼈说French，60⼈说Russian，80⼈说Italy，说两种语⾔的有50⼈，说三种语⾔的有10⼈。
共有125⼈，问不说这些语⾔的有⼏⼈。
Key:125-（40+60+80-50-10*2）=155 。
等腰直⾓三⾓形边长2加2倍根号2，求⾯积。
6. 某种溶液浓度为125gram per liter，转换成ounce per gallon，求表达式。
已知 1 ounce=28.xxx gram and 1 gallon=3.875 liter7. x，y，z 均⽅差为d，求x+10，y+10，z+10的均⽅差（d）8. 1的概率是0.8，2的概率是0，6，问是1或是2或是both的概率，1-0.6*0.8（数字瞎编）=0.92.9. 还有⼀组测量数据中，12.1⽐mean低1.5个标准差，17.5⽐mean⾼3.0个标准⽅差。
问mean是多少.13.9（设标准差为X12.1+1.5X=M，17.5-3X=M）10. 图表题，1992年总和是50，96年是60，每年⾄少增长1，问最⼤的年增长：7.011 .x+y=5&2x+2y=8之间最短距离与1⽐较《112. 以40miles/hour速度经过⼀1.5miles的路，若超速则罚款fine=50+（速度-40）*10，现⼀⼈⽤108秒通过此路，问她的fine=？key 15013. xyz togather finish the task for 9 hour，xy togather need 12 hour，z alone needs ？hour. key 3614. 直线l.在X轴截距是3，在Y轴截距是4。
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2020年1月22日GRE数学机经预测
What are the x-intercepts of the parabola defined by theequation y =2x2–8x –90?
Indicate allx-intercepts.
A. -10
B. -9
C. -5
D. -4
E. 4
F. 5
G. 9
H. 10
解析：C, G
因为求x轴截距，所以y=0，所以2x2–8x –90=0，所以(2x+10)(x-9)=0. 所以x= -5, 或者x=9. 所以选C,G.
The system of equations has how many solutions?
3x - 6y = 9
2y - x - 3 = 0
A. None
B. Exactly 1
C. Exactly 2
D. Exactly 3
E. Infinitely many
解析：B
因为3x - 6y = 9，所以x-2y=3. 因为2y - x - 3 = 0，所以
2y-x=3. 所以x-2y=2y-x. 所以x=0,y=0.只有这个种可能。
所以选B.
If x=3k/√5 and k>0， which of the following must be true?
解析：C
因为，所以x=(3√5)/5 k，所以k
For the 3 numbers in a certain list, the average (arithmetic mean) and the median are equal to 16. If the greatest number in the List is 14 greater than the least number, what is the greatest number in the list?
解析：23
设最小的数为x,因为的数比最小的数大14，所以的数为x+14.因为这三个数的平均值为16，且中间的数值为16，所以
(x+16+(x+14))/3=16.所以x=9. 所以的数为9+14=23.
When thepositive integer dis divided by 12, the remainder is 5. Whatis the remainder when d is divided by 8 ?
A. 1
B.3
C.5
D.6
E.7
解析：A
正整数d被12整除后余5，所以正整数d为12*5+5=65. 所以〖65〗^2除以8等于528余1.所以选A。
In agroup of 60 people, the average (arithmetic mean) age of the 40 females is 60,and the average age of the 20 males
is 70.
Column A ColumnB
Average age of all 60 people 65
A. Thequantity in Column A is greater
B. Thequantity in Column B is greater
C. The twoquantities are equal
D. Therelationship cannot be determined from the information given
解析：
因为一共有60个人，40个人的平均年龄是60岁，20个人的平均年龄是70岁。
所以这60个人的平均年龄为(40*60+20*70)/60=63.33.
63.33<65,所以B更大。
所以选B。