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  • GWD–TN24套 题目总数:2172 做题总人数:20667 平均准确率:70.8%

    源自GMAT GWD真题库,是参考往年流传的一些考试真题整理而成,帮助你了解一些经典难题,GWD部分题目过于勉强,因此建议大家作为备考辅助练习使用,主要用于练习pace即可。

    • 【阅读RC】-15558 -GWD–TN24套

      A small number of the forest species of lepidoptera (moths and butterflies, which exist as caterpillars during most of their life cycle) exhibit regularly recurring patterns of population growth and decline—such fluctuations in population are known as population cycles. Although many different variables influence population levels, a regular pattern such as a population cycle seems to imply a dominant, driving force. Identification of that driving force, however, has proved surprisingly elusive despite considerable research. The common approach of studying causes of population cycles by measuring the mortality caused by different agents, such as predatory birds or parasites, has been unproductive in the case of lepidoptera. Moreover, population ecologists' attempts to alter cycles by changing the caterpillars' habitat and by reducing caterpillar populations have not succeeded. In short, the evidence implies that these insect populations, if not self-regulating, may at least be regulated by an agent more intimately connected with the insect than are predatory birds or parasites.Recent work suggests that this agent may be a virus.For many years, viral disease had been reported in declining populations of caterpillars, but population ecologists had usually considered viral disease to have contributed to the decline once it was underway rather than to have initiated it. The recent work has been made possible by new techniques of molecular biology that allow viral DNA to be detected at low concentrations in the environment. Nuclear polyhedrosis viruses are hypothesized to be the driving force behind population cycles in lepidoptera in part because the viruses themselves follow an infectious cycle in which, if protected from direct sun light, they may remain virulent for many years in the environment, embedded in durable crystals of polyhedrin protein. Once ingested by a caterpillar, the crystals dissolve, releasing the virus to infect the insect's cells. Late in the course of the infection, millions of new virus particles are formed and enclosed in polyhedron crystals. These crystals reenter the environment after the insect dies and decomposes, thus becoming available to infect other caterpillars.One of the attractions of this hypothesis is its broad applicability. Remarkably, despite significant differences in habitat and behavior, many species of lepidoptera have population cycles of similar length, between eight and eleven years. Nuclear polyhedrosis viral infection is one factor these disparate species share."

      来源:GWD–TN24套 、精选题库 393人已做 650难度 76.8%正确率

    • 【阅读RC】-15557 -GWD–TN24套

      A small number of the forest species of lepidoptera (moths and butterflies, which exist as caterpillars during most of their life cycle) exhibit regularly recurring patterns of population growth and decline—such fluctuations in population are known as population cycles. Although many different variables influence population levels, a regular pattern such as a population cycle seems to imply a dominant, driving force. Identification of that driving force, however, has proved surprisingly elusive despite considerable research. The common approach of studying causes of population cycles by measuring the mortality caused by different agents, such as predatory birds or parasites, has been unproductive in the case of lepidoptera. Moreover, population ecologists' attempts to alter cycles by changing the caterpillars' habitat and by reducing caterpillar populations have not succeeded. In short, the evidence implies that these insect populations, if not self-regulating, may at least be regulated by an agent more intimately connected with the insect than are predatory birds or parasites.Recent work suggests that this agent may be a virus.For many years, viral disease had been reported in declining populations of caterpillars, but population ecologists had usually considered viral disease to have contributed to the decline once it was underway rather than to have initiated it. The recent work has been made possible by new techniques of molecular biology that allow viral DNA to be detected at low concentrations in the environment. Nuclear polyhedrosis viruses are hypothesized to be the driving force behind population cycles in lepidoptera in part because the viruses themselves follow an infectious cycle in which, if protected from direct sun light, they may remain virulent for many years in the environment, embedded in durable crystals of polyhedrin protein. Once ingested by a caterpillar, the crystals dissolve, releasing the virus to infect the insect's cells. Late in the course of the infection, millions of new virus particles are formed and enclosed in polyhedron crystals. These crystals reenter the environment after the insect dies and decomposes, thus becoming available to infect other caterpillars.One of the attractions of this hypothesis is its broad applicability. Remarkably, despite significant differences in habitat and behavior, many species of lepidoptera have population cycles of similar length, between eight and eleven years. Nuclear polyhedrosis viral infection is one factor these disparate species share."

      来源:GWD–TN24套 、破解版07 、Manhattan 、破解版08 、破解版12 、精选题库 、测评题 497人已做 650难度 50.9%正确率

    • 【阅读RC】-15556 -GWD–TN24套

      A small number of the forest species of lepidoptera (moths and butterflies, which exist as caterpillars during most of their life cycle) exhibit regularly recurring patterns of population growth and decline—such fluctuations in population are known as population cycles. Although many different variables influence population levels, a regular pattern such as a population cycle seems to imply a dominant, driving force. Identification of that driving force, however, has proved surprisingly elusive despite considerable research. The common approach of studying causes of population cycles by measuring the mortality caused by different agents, such as predatory birds or parasites, has been unproductive in the case of lepidoptera. Moreover, population ecologists' attempts to alter cycles by changing the caterpillars' habitat and by reducing caterpillar populations have not succeeded. In short, the evidence implies that these insect populations, if not self-regulating, may at least be regulated by an agent more intimately connected with the insect than are predatory birds or parasites.Recent work suggests that this agent may be a virus.For many years, viral disease had been reported in declining populations of caterpillars, but population ecologists had usually considered viral disease to have contributed to the decline once it was underway rather than to have initiated it. The recent work has been made possible by new techniques of molecular biology that allow viral DNA to be detected at low concentrations in the environment. Nuclear polyhedrosis viruses are hypothesized to be the driving force behind population cycles in lepidoptera in part because the viruses themselves follow an infectious cycle in which, if protected from direct sun light, they may remain virulent for many years in the environment, embedded in durable crystals of polyhedrin protein. Once ingested by a caterpillar, the crystals dissolve, releasing the virus to infect the insect's cells. Late in the course of the infection, millions of new virus particles are formed and enclosed in polyhedron crystals. These crystals reenter the environment after the insect dies and decomposes, thus becoming available to infect other caterpillars.One of the attractions of this hypothesis is its broad applicability. Remarkably, despite significant differences in habitat and behavior, many species of lepidoptera have population cycles of similar length, between eight and eleven years. Nuclear polyhedrosis viral infection is one factor these disparate species share."

      来源:GWD–TN24套 、精选题库 435人已做 650难度 53.8%正确率

    • 【阅读RC】-15555 -GWD–TN24套

      A small number of the forest species of lepidoptera (moths and butterflies, which exist as caterpillars during most of their life cycle) exhibit regularly recurring patterns of population growth and decline—such fluctuations in population are known as population cycles. Although many different variables influence population levels, a regular pattern such as a population cycle seems to imply a dominant, driving force. Identification of that driving force, however, has proved surprisingly elusive despite considerable research. The common approach of studying causes of population cycles by measuring the mortality caused by different agents, such as predatory birds or parasites, has been unproductive in the case of lepidoptera. Moreover, population ecologists' attempts to alter cycles by changing the caterpillars' habitat and by reducing caterpillar populations have not succeeded. In short, the evidence implies that these insect populations, if not self-regulating, may at least be regulated by an agent more intimately connected with the insect than are predatory birds or parasites.Recent work suggests that this agent may be a virus.For many years, viral disease had been reported in declining populations of caterpillars, but population ecologists had usually considered viral disease to have contributed to the decline once it was underway rather than to have initiated it. The recent work has been made possible by new techniques of molecular biology that allow viral DNA to be detected at low concentrations in the environment. Nuclear polyhedrosis viruses are hypothesized to be the driving force behind population cycles in lepidoptera in part because the viruses themselves follow an infectious cycle in which, if protected from direct sun light, they may remain virulent for many years in the environment, embedded in durable crystals of polyhedrin protein. Once ingested by a caterpillar, the crystals dissolve, releasing the virus to infect the insect's cells. Late in the course of the infection, millions of new virus particles are formed and enclosed in polyhedron crystals. These crystals reenter the environment after the insect dies and decomposes, thus becoming available to infect other caterpillars.One of the attractions of this hypothesis is its broad applicability. Remarkably, despite significant differences in habitat and behavior, many species of lepidoptera have population cycles of similar length, between eight and eleven years. Nuclear polyhedrosis viral infection is one factor these disparate species share."

      来源:GWD–TN24套 569人已做 650难度 61%正确率

    • 【句子改错SC】-14459 -GWD–TN24套

      Judge Lois Forer's study asks why do some litigants have a preferred status over others in the use of a public resource, the courts, which in theory are available to all but in fact are unequally distributed among rich and poor.

      来源:GWD–TN24套 1040人已做 600难度 73%正确率

    • 【逻辑CR】-14450 -GWD–TN24套

      Consumer health advocate:Your candy company adds caffeine to your chocolate candy bars so that each one delivers a specified amount of caffeine. Since caffeine is highly addictive, this indicates that you intend to keep your customers addicted.Candy manufacturer:Our manufacturing process results in there being less caffeine in each chocolate candy bar than in the unprocessed cacao beans from which the chocolate is made.The candy manufacturer's response is flawed as a refutation of the consumer health advocate's argument because it

      来源:GWD–TN24套 1117人已做 600难度 79.9%正确率

    • 【逻辑CR】-14449 -GWD–TN24套

      Since the mayor's publicity campaign for Greenville's bus service began six months ago.morning automobile traffic into the midtown area of the city has decreased seven percent.During the same period, there has been an equivalent rise in the number of persons riding buses into the midtown area.Obviously, the mayor's publicity campaign has convinced many people to leave their cars at home and ride the bus to work.Which of the following, if true, casts the most serious doubt on the conclusion drawn above?

      来源:GWD–TN24套 838人已做 600难度 84.1%正确率

    • 【逻辑CR】-14448 -GWD–TN24套

      Which of the following, if true, most logically completes the argument below?Manufacturers are now required to make all cigarette lighters child-resistant by equipping them with safety levers. But this change is unlikely to result in a significant reduction in the number of fi res caused by children playing with lighters, because children given the opportunity can figure out how to work the safety levers and_____.

      来源:GWD–TN24套 926人已做 600难度 91.3%正确率

    • 【逻辑CR】-14447 -GWD–TN24套

      A bakery estimates its predicted yearly expenditures on ingredients when allocating its annual food budget by adding a correction factor of five percent to its costs from the previous year. This method allows the bakery to quickly and simply account for annual increases in the cost of raw ingredients.Which of the following, if true, would most call into question the economic soundness of the bakery's method for estimating its food budget?

      来源:GWD–TN24套 852人已做 600难度 73.4%正确率

    • 【问题求解PS】-14209 -GWD–TN24套

      43 + 43 + 43 + 43 =

      来源:GWD–TN24套 255人已做 600难度 93.3%正确率

最新讨论题目
  • 【句子改错SC】

    【OG20-P801-845题】Tides typically range from three to six feet, but while some places show no tides at all, some others, such as the Bay of Fundy, have tides of at least thirty feet and more.

  • 【问题求解PS】

    A store currently charges the same price for each towel that it sells. If the current price of each towel were to be increased by $1,10 fewer of the towels could be bought for $120, excluding sales tax. What is the current price of each towel?

  • 【数据充分DS】

    【OG20-P283-345题】Jack wants to use a circular rug on his rectangular office floor to cover two small circular stains, each less thansquare feet in area and each more than  3 feet from the nearest wall. Can the rug be placed to cover both stains?(1)Jack’s rug covers an area of 9π ​ square feet.(2)The centers of the stains are less than 4 feet apart.

  • 【句子改错SC】

    Since digital recording offers essentially perfect reproduction—on compact discs, digital audiotapes, ordigital videodiscs—audiophiles can accumulate vast collections of music, transferring them from oneformat to another, copying it, and digitally altering it with little effort and not damaging the sound quality.

  • 【逻辑CR】

    【OG20-P604-745题】Although the discount stores in Goreville's central shopping district are expected to close within five years as a result of competition from a Spendless discount department store that just opened, those locations will not stay vacant for long. In the five years since the opening of Colson's, a nondiscount department store, a new store has opened at the location of every store in the shopping district that closed because it could not compete with Colson's. Which of the following, if true, most seriously weakens the argument? 

  • 【逻辑CR】

    Guillemots are birds of Arctic regions. They feed on fish that gather beneath thin sheets of floating ice, and they nest on nearby land. Guillemots need 80 consecutive snow-free days in a year to raise their chicks, so until average temperatures in the Arctic began to rise recently, the guillemots’ range was limited to the southernmost Arctic coast. Therefore, if the warming continues, the guillemots’ range will probably be enlarged by being extended northward along the coast.Which of the following, if true, most seriously weakens the argument?

  • 【句子改错SC】

    Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery and because coal replaced charcoal as the fuel used in the smelting of iron ore. 

  • 【句子改错SC】

    The current economic downturn has significantly reduced advertising income both for business journals as well as general consumer magazines, especially if focusing on technology. 

  • 【逻辑CR】

    A popular beach has long had a dolphin feeding program in which fish are given to dolphins several times a day; many dolphins get as much as half of their food each day there.  Although dolphins that first benefit from the program as adults are healthy and long-lived, their offspring have a lower life expectancy than offspring of dolphins that feed exclusively in the wild. Which of the following, if true, most helps to explain the lower life expectancy of offspring of dolphins feeding at the beach compared to other young dolphins?

  • 【句子改错SC】

    It was only after Katharine Graham became publisher of The Washington Post in 1963 that it moved into the first rank of American newspapers, and it was under her command that the paper won high praise for its unrelenting reporting of the Watergate scandal.

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