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  • OG19新题 题目总数:142 做题总人数:13421 平均准确率:77.8%

    2018年6月出版,OG19新题即OG2019综合册里与OG18相比新增的题目。此内容做为官方题源可以帮助大家更好的需要了解考点,了解考试趋势和考官思维。OG建议大家刷3遍,第一遍刷纸质,第二遍计时精刷,第三遍刷错题。做完后记得及时分析总结。

    • 【问题求解PS】-18471 -OG2022分册

      3. The sum S of the first n consecutive positive even integers is given by S = n(n + 1). For what value of n is this sum equal to 110 ?

      来源:OG2022分册 2人已做 其他难度 100%正确率

    • 【问题求解PS】-18470 -OG2022分册

      1.Working at a constant rate, a copy machine makes 20 copies of a one-page document per minute. If the machine works at this constant rate, how many hours does it take to make 4,800 copies of a one-page document?

      来源:OG2022分册 1人已做 其他难度 100%正确率

    • 【逻辑CR】-18469 -OG2022分册

      A computer equipped with signature‐recognition software, which restricts access to a computer to those people whose signatures are on file, identifies a person’s signature by analyzing not only the form of the signature but also such characteristics as pen pressure and signing speed. Even the most adept forgers cannot duplicate all of the characteristics the program analyzes. Which of the following can be logically concluded from the passage above?

      来源:OG2022分册 2人已做 其他难度 50%正确率

    • 【逻辑CR】-18468 -OG2022分册

      At several locations on the northwest coast of North America are formations known as chevrons—wedge-shaped formations of mounded sediment—pointing toward the ocean. Most geologists take them to have been formed by erosion, but recently other scientists have proposed that they were thrown up from the ocean by massive waves triggered by meteor impacts in the Pacific Ocean. Which of the following, if discovered, would most help in deciding which hypothesis is correct?

      来源:OG2022分册 0人已做 其他难度 0%正确率

    • 【逻辑CR】-18467 -OG2022分册

      Although Ackerburg’s subway system is currently operating at a deficit, the transit authority will lower subway fares next year. The authority projects that the lower fares will result in a ten percent increase in the number of subway riders. Since the additional income from the larger ridership will more than offset the decrease due to lower fares, the transit authority actually expects the fare reduction to reduce or eliminate the subway system’s operating deficit for next year. Which of the following, if true, provides the most support for the transit authority’s expectation of reducing the subway system’s operating deficit?

      来源:OG2022分册 2人已做 其他难度 100%正确率

    • 【逻辑CR】-18465 -OG2022分册

      In its search for new technologies for solar energy that can produce lower-cost electricity, Smith-Diatom is developing a new way to make dye-sensitive solar cells, in which photons strike light-sensitive dyes. The process uses diatoms, which are unicellular algae that have silicon shells with a complex structure. First, the organic material is removed, and then the shells are coated with a titanium dioxide film that acts as a semiconductor. The diatoms’ structure results in more photon activity and thus more efficient production of electricity than with current dye-sensitized solar cells, which in turn lowers the cost. Which of the following considerations would, if true, most strongly support the hypothesis that the plan, if implemented, will produce low-cost electricity from dye-sensitive solar cells?

      来源:OG2022分册 2人已做 其他难度 100%正确率

    • 【逻辑CR】-18464 -OG2022分册

      The XCT automobile is considered less valuable than the ZNK automobile, because insurance companies pay less, on average, to replace a stolen XCT than a stolen ZNK. Surprisingly, the average amount insurance companies will pay to repair a car involved in a collision is typically higher for the XCT than for the ZNK. One insurance expert explained that repairs toXCT automobiles are especially labor-intensive, and labor is a significant factor in collision repair costs. Which of the following, if true, most strongly supports the insurance expert’s explanation?

      来源:OG2022分册 1人已做 其他难度 0%正确率

    • 【逻辑CR】-18462 -OG2022分册

      Stockholders have been critical of the Flyna Company, a major furniture retailer, because most of Flyna’s furniture is manufactured in Country X from local wood, and illegal logging is widespread there. However, Flyna has set up a certification scheme for lumber mills. It has hired a staff of auditors and forestry professionals who review documentation of the wood supply of Country X’s lumber mills to ensure its legal origin, make surprise visits to mills to verify documents, and certify mills as approved sources of legally obtained lumber. Flyna uses only lumber from certified mills. Thus, Flyna’s claim that its Country X wood supply is obtained legally is justified. Which of the following, if true, would most undermine the justification provided for Flyna’s claim?

      来源:OG2022分册 2人已做 其他难度 100%正确率

    • 【阅读RC】-18461 -搞定GMAT阅读

      Milankovitch proposed in the early twentieth century that the ice ages were caused by variations in the Earth’s orbit around the Sun. For some time this theory was considered untestable, largely because there was no sufficiently precise chronology of the ice ages with which the orbital variations could be matched. To establish such a chronology it is necessary to determine the relative amounts of land ice that existed at various times in the Earth’s past. A recent discovery makes such a determination possible: relative land-ice volume for a given period can be deduced from the ratio of two oxygen isotopes, 16 and 18, found in ocean sediments. Almost all the oxygen in water is oxygen 16, but a few molecules out of every thousand incorporate the heavier isotope 18. When an ice age begins, the continental ice sheets grow, steadily reducing the amount of water evaporated from the ocean that will eventually return to it. Because heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18. The degree of enrichment can be determined by analyzing ocean sediments of the period, because these sediments are composed of calcium carbonate shells of marine organisms, shells that were constructed with oxygen atoms drawn from the surrounding ocean. The higher the ratio of oxygen 18 to oxygen 16 in a sedimentary specimen, the more land ice there was when the sediment was laid down. As an indicator of shifts in the Earth’s climate, the isotope record has two advantages. First, it is a global record: there is remarkably little variation in isotope ratios in sedimentary specimens taken from different continental locations. Second, it is a more continuous record than that taken from rocks on land. Because of these advantages, sedimentary evidence can be dated with sufficient accuracy by radiometric methods to establish a precise chronology of the ice ages. The dated isotope record shows that the fluctuations in global ice volume over the past several hundred thousand years have a pattern: an ice age occurs roughly once every 100,000 years. These data have established a strong connection between variations in the Earth’s orbit and the periodicity of the ice ages. However, it is important to note that other factors, such as volcanic particulates or variations in the amount of sunlight received by the Earth, could potentially have affected the climate. The advantage of the Milankovitch theory is that it is testable; changes in the Earth’s orbit can be calculated and dated by applying Newton’s laws of gravity to progressively earlier configurations of the bodies in the solar system. Yet the lack of information about other possible factors affecting global climate does not make them unimportant.

      来源:搞定GMAT阅读 28人已做 其他难度 67.9%正确率

    • 【阅读RC】-18460 -搞定GMAT阅读

      Milankovitch proposed in the early twentieth century that the ice ages were caused by variations in the Earth’s orbit around the Sun. For some time this theory was considered untestable, largely because there was no sufficiently precise chronology of the ice ages with which the orbital variations could be matched. To establish such a chronology it is necessary to determine the relative amounts of land ice that existed at various times in the Earth’s past. A recent discovery makes such a determination possible: relative land-ice volume for a given period can be deduced from the ratio of two oxygen isotopes, 16 and 18, found in ocean sediments. Almost all the oxygen in water is oxygen 16, but a few molecules out of every thousand incorporate the heavier isotope 18. When an ice age begins, the continental ice sheets grow, steadily reducing the amount of water evaporated from the ocean that will eventually return to it. Because heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18. The degree of enrichment can be determined by analyzing ocean sediments of the period, because these sediments are composed of calcium carbonate shells of marine organisms, shells that were constructed with oxygen atoms drawn from the surrounding ocean. The higher the ratio of oxygen 18 to oxygen 16 in a sedimentary specimen, the more land ice there was when the sediment was laid down. As an indicator of shifts in the Earth’s climate, the isotope record has two advantages. First, it is a global record: there is remarkably little variation in isotope ratios in sedimentary specimens taken from different continental locations. Second, it is a more continuous record than that taken from rocks on land. Because of these advantages, sedimentary evidence can be dated with sufficient accuracy by radiometric methods to establish a precise chronology of the ice ages. The dated isotope record shows that the fluctuations in global ice volume over the past several hundred thousand years have a pattern: an ice age occurs roughly once every 100,000 years. These data have established a strong connection between variations in the Earth’s orbit and the periodicity of the ice ages. However, it is important to note that other factors, such as volcanic particulates or variations in the amount of sunlight received by the Earth, could potentially have affected the climate. The advantage of the Milankovitch theory is that it is testable; changes in the Earth’s orbit can be calculated and dated by applying Newton’s laws of gravity to progressively earlier configurations of the bodies in the solar system. Yet the lack of information about other possible factors affecting global climate does not make them unimportant.

      来源:搞定GMAT阅读 24人已做 其他难度 58.3%正确率

最新讨论题目
  • 【数据充分DS】

    If cubical blocks in a display are stacked one on top of the other on a flat surface, what is the volume of the stack of blocks in cubic centimeters?(1)The volume of the top block is 8 cubic centimeters.(2)The height of the stack of blocks is 10 centimeters.

  • 【数据充分DS】

    How many factors does x have, if x is a positive integer?(1) x=pn  , where p is a prime number.(2)  nn=n+n , where x is a positive integer.

  • 【问题求解PS】

    Positive integer n leaves a remainder of 4 after division by 6 and a remainder of 3 after division by 5. If n is greater than 30, what is the remainder that n leaves after division by 30?

  • 【问题求解PS】

     38  of all students at Social High are in all three of the following clubs: Albanian, Bardic, and Checkmate. 12  of all students are in Albanian, 58   are in Bardic, and 34  ​ are in Checkmate. If every student is in at least one club, what fraction of the student body is in exactly 2 clubs?

  • 【句子改错SC】

    Remembered almost as an epic among America’s 12,000 Bosnian Muslims is the digging of Chicago’s subway tunnels in the early 1900s, one of the proudest of family legends.

  • 【阅读RC】

    【OG20-P446-572题】It can be inferred from the passage that the author believes which of the following to be true of the amphibian extinctions that have recently been reported?

  • 【句子改错SC】

    It is unclear whether chimpanzees are unique among nonhuman species in their ability to learn behaviors from one another, or if, when other animals are studied in as much depth, similar patterns would be found.

  • 【句子改错SC】

    【OG20-P785-762题】In a speech before the Senate Banking Committee, the chairman of the Federal Reserve painted an optimistic picture of the economy, suggesting to investors the central bank in the near future is not lowering interest rates. 

  • 【问题求解PS】

    【OG20-P178-207题】Last year the price per share of Stock X increased by k percent and the earnings per share of Stock X increased by m percent, where k is greater than m. By what percent did the ratio of price per share to earnings per share increase, in terms of k and m ?

  • 【逻辑CR】

    The prairie vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters.  Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups.  The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles. Which of the following, if true, provides the strongest support for the explanation offered?

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