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题库总题数: 9689
做题总人数: 140121
平均每天做题人数: 2323
  • 自测章作为每本OG必带内容,是GMAT考生了解考试内容,考试题型和自我检测的重要部分,建议GMAT考生在正式刷OG之前先做自测章题目。

    101
    题目总数

    3426
    做题总人数

    68.1%
    平均准确率

    • 【句子改错SC】-15761 -OG18自测章

      As an actress and, more importantly, as a teacher of acting, Stella Adler was one of the most influential artists in the American theater, who trained several generations of actors including Marlon Brando and Robert De Niro.

      来源: 465人已做 600难度 29.5%正确率

    • 【逻辑CR】-15760 -OG18自测章

      Prolonged spells of hot, dry weather at the end of the grape-growing season typically reduce a vineyard’s yield, because the grapes stay relatively small. In years with such weather, wine producers can make only a relatively small quantity of wine from a givenarea of vineyards. Nonetheless, in regions where wine producers generally grow their own grapes, analysts typically expect a long, hot, dry spell late in the growing season to result in increased revenues for local wine producers.Which of the following, if true, does most to justify the analysts' expectation?

      来源: 329人已做 其他难度 78.1%正确率

    • 【逻辑CR】-15759 -OG18自测章

      In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners and steering bars. Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow. The concern that plastic sleds are more dangerous is clearly borne out by the fact that the number of children injured while sledding was much higher last winter than it was 10 years ago.Which of the following, if true in Verland, most seriously undermines the force of the evidence cited?

      来源: 327人已做 其他难度 57.8%正确率

    • 【逻辑CR】-15758 -OG18自测章

      Metal rings recently excavated from seventh-century settlements in the western part of Mexico were made using the same metallurgical techniques as those used by Ecuadorian artisans before and during that period. These techniques are sufficiently complex to make their independent development in both areas unlikely. Since the people of these two areas were in cultural contact, archaeologists hypothesize that the metallurgical techniques used to make the rings found in Mexico were learned by Mexican artisans from Ecuadorian counterparts.Which of the following would it be most useful to establish in order to evaluate the archaeologists’ hypothesis?

      来源: 313人已做 其他难度 57.8%正确率

    • 【逻辑CR】-15757 -OG18自测章

      Following several years of declining advertising sales, the Greenville Times reorganized its advertising sales force. Before reorganization, the sales force was organized geographically, with some sales representatives concentrating on city-center businesses and others concentrating on different outlying regions. The reorganization attempted to increase the sales representatives’ knowledge of clients’ businesses by having each sales representative deal with only one type of industry or of retailing. After the reorganization, revenue from advertising sales increased.In assessing whether the improvement in advertising sales can properly be attributed to the reorganization, it would be most helpful to find out which of the following?

      来源: 341人已做 其他难度 38.1%正确率

    • 【逻辑CR】-15756 -OG18自测章

      Motorists in a certain country frequently complain that traffic congestion is much worse now than it was 20 years ago. No real measure of how much traffic congestion there was 20 years ago exists, but the motorists’ complaints are almost certainly unwarranted. The country’s highway capacity has tripled in the last twenty years, thanks to a vigorous highway construction program, whereas the number of automobiles registered in the country has increased by only 75 percent.Which of the following, if true, most seriously weakens the argument?

      来源: 299人已做 其他难度 79.6%正确率

    • 【逻辑CR】-15755 -OG18自测章

      The percentage of households with an annual income of more than $40,000 is higher in Merton County than in any other county. However, the percentage of households with an annual income of $60,000 or more is higher in Sommer County.If the statements above are true, which of the following must also be true?

      来源:精选题库 296人已做 其他难度 77.7%正确率

    • 【逻辑CR】-15754 -OG18自测章

      Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, a tiger beetle will intermittently stop and then, a moment later, resume its attack. Perhaps the beetles cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running, tiger beetles are unable to adequately process the resulting rapidly changing visual information and so quickly go blind and stop.Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the twohypotheses and undermine the other?

      来源: 317人已做 其他难度 33.1%正确率

    • 【逻辑CR】-15753 -OG18自测章

      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?

      来源: 325人已做 其他难度 44%正确率

    • 【逻辑CR】-15752 -OG18自测章

      Some batches of polio vaccine used around 1960 were contaminated with SV40, a virus that in monkeys causes various cancers. Some researchers now claim that this contamination caused some cases of a certain cancer in humans, mesothelioma. This claim is not undercut by the fact that a very careful survey made in the 1960s of people who had received the contaminated vaccine found no elevated incidence of any cancer, since ___________.

      来源: 283人已做 其他难度 74.6%正确率

热门讨论
  • 【数据充分DS】

    【OG20-P290-424题】The only articles of clothing in a certain closet are shirts, dresses, and jackets. The ratio of the number of shirts to the number of dresses to the number of jackets in the closet is 9:4:5, respectively. If there are more than 7 dresses in the closet, what is the total number of articles of clothing in the closet?(1) The total number of shirts and jackets in the closet is less than 30.(2) The total number of shirts and dresses in the closet is 26.

  • 【逻辑CR】

    Sasha: It must be healthy to follow a diet high in animal proteins and fats. Human beings  undoubtedly evolved to thrive on such a diet, since our prehistoric ancestors ate large amounts  of meat. Jamal: But our ancestors also exerted themselves intensely in order to obtain this food, whereas  most human beings today are much less physically active. Jamal responds to Sasha by doing which of the following?

  • 【数据充分DS】

    【OG20-P289-410题】If r and s are positive integers, can the fraction r/s be expressed as a decimal with only a finite number of nonzero digits?(1) s is a factor of 100.(2) r is a factor of 100.

  • 【问题求解PS】

    【OG20-P181-228题】How many of the integers that satisfy the inequality (x+2)(x+3)x−2 ≥0   are less than 5?

  • 【数据充分DS】

    If ab ≠ 0 and points (-a, b) and (-b, a) are in the same quadrant of the xy-plane, is point (-x, y) in this same quadrant?(1) xy > 0(2) ax > 0

  • 【问题求解PS】

    【OG18-P162-111题】At a certain instant in time, the number of cars, N, traveling on a portion of a certain highway can be estimated by the formula N= 20Ld600+s2 where L is the number of lanes in the same direction, d is the length of the portion of the highway, in feet, and s is the average speed of the cars, in miles per hour. Based on the formula, what is the estimated number of cars traveling on a 1/2 mile portion of the Highway if the highway has 2 lanes in the same direction and the average speed of the cars is 40 miles per hour? (5,280 feet =1mile)

  • 【句子改错SC】

    Since the 1930s aircraft manufacturers have tried to build airplanes with frictionless wings, shaped so smoothly and perfectly that the air passing over them would not become turbulent.

  • 【逻辑CR】

    【OG20-P562-610题】 Arts advocate: Few universities require that students who are specializing in science and technology take many art courses.However, real progress in science and technology requires an element of creativity,which the arts foster. Thus,to help science and  technology  students succeed in  their careers, universities should increase the number of art courses  required for them.Which of the following would,if true, most strengthen the argument above?

  • 【逻辑CR】

    【OG20-P585-685题】A company has developed a new sensing device that, according to the company's claims, detects weak, ultralow-frequency electromagnetic signals associated with a beating heart. These signals, which pass through almost any physical obstruction, are purportedly detected by the device even at significant distances. Therefore, if the company’s claims are true, their device will radically improve emergency teams ability to locate quickly people who are trapped within the wreckage of collapsed buildings. Which of the following, if true, most strengthens the argument?

  • 【句子改错SC】

    【OG20-P814-903题】In the major cities of industrialized countries at the end of the nineteenth century,important public places such as theaters,restaurants,shops,and banks had installed electric lighting ,but electricity was in less than 1 percent of homes,where lighting was still provided mainly by candles or gas.

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