2013年GMAT考试最新逻辑推理试题训练十五

2013年GMAT考试最新逻辑推理试题训练十五

查看汇总：2013年GMAT考试最新逻辑推理试题训练汇总

　　1. A drug that is highly effective in treating many types of infection can, at present, be obtained only from the bark of the ibora, a tree that is quite rare in the wild. It takes the bark of 5,000 trees to make one kilogram of the drug. It follows, therefore, that continued production of the drug must inevitably lead to the ibora’s extinction.Which of the following, if true, most seriously weakens the argument above?

　　(A) The drug made from ibora bark is dispensed to doctors from a central authority.

　　(B) The drug made from ibora bark is expensive to produce.

　　(C) The leaves of the ibora are used in a number of medical products.

　　(D) The ibora can be propagated from cuttings and grown under cultivation.

　　(E) The ibora generally grows in largely inaccessible places.

　　2. High levels of fertilizer and pesticides, needed when farmers try to produce high yield of the same crop year after year, pollute water supplies. Experts therefore urge farmers to diversify their crops and to rotate their plantings yearly.To receive governmental price-support benefits for a crop, farmers must have produced that same crop for the past several years.The statements above, if true, best support which of the following conclusions?

　　(A) The rules for governmental support of farm prices work against efforts to reduce water pollution.

　　(B) The only solution to the problem of water pollution from fertilizers and pesticides is to take farmland out of production.

　　(C) Farmers can continue to make a profit by rotating diverse crops, thus reducing costs for chemicals, but not by planting the same crop each year.

　　(D) New farming techniques will be developed to make it possible for farmers to reduce the application of fertilizers and pesticides.

　　(E) Governmental price supports for farm products are set at levels that are not high enough to allow farmers to get out of debt.

　　3. Shelby Industries manufactures and sells the same gauges as Jones Industries. Employee wages account for forty percent of the cost of manufacturing gauges at both Shelby Industries and Jones Industries. Shelby Industries is seeking a competitive advantage over Jones Industries. Therefore, to promote this end, Shelby Industries should lower employee wages.Which of the following, if true, would most weaken the argument above?

　　(A) Because they make a small number of precision instruments, gauge manufacturers cannot receive volume discounts on raw materials.

　　(B) Lowering wages would reduce the quality of employee work, and this reduced quality would lead to lowered sales.

　　(C) Jones Industries has taken away twenty percent of Shelby Industries’ business over the last year.

　　(D) Shelby Industries pays its employees, on average, ten percent more than does Jones Industries.

　　(E) Many people who work for manufacturing plants live in areas in which the manufacturing plant they work for is the only industry.

　　4. Some communities in Florida are populated almost exclusively by retired people and contain few, if any, families with small children. Yet these communities are home to thriving businesses specializing in the rental of furniture for infants and small children.Which of the following, if true, best reconciles the seeming discrepancy described above?

　　(A) The businesses specializing in the rental of children’s furniture buy their furniture from distributors outside of Florida.

　　(B) The few children who do reside in these communities all know each other and often make overnight visits to one another’s houses.

　　(C) Many residents of these communities who move frequently prefer renting their furniture to buying it outright.

　　(D) Many residents of these communities must provide for the needs of visiting grandchildren several weeks a year.

　　(E) Children’s furniture available for rental is of the same quality as that available for sale in the stores.

　　5. Large national budget deficits do not cause large trade deficits. If they did, countries with the largest budget deficits would also have the largest trade deficits. In fact, when deficit figures are adjusted so that different countries are reliably comparable to each other, there is no such correlation.If the statements above are all true, which of the following can properly be inferred on the basis of them?

　　(A) Countries with large national budget deficits tend to restrict foreign trade.

　　(B) Reliable comparisons of the deficit figures of one country with those of another are impossible.

　　(C) Reducing a country’s national budget deficit will not necessarily result in a lowering of any trade deficit that country may have.

　　(D) When countries are ordered from largest to smallest in terms of population, the smallest countries generally have the smallest budget and trade deficits.

　　(E) Countries with the largest trade deficits never have similarly large national budget deficits.

　　6. “Fast cycle time” is a strategy of designing a manufacturing organization to eliminate bottlenecks and delays in production. Not only does it speed up production, but it also assures quality. The reason is that the bottlenecks and delays cannot be eliminated unless all work is done right the first time.The claim about quality made above rests on a questionable presupposition that

　　(A) any flaw in work on a product would cause a bottleneck or delay and so would be prevented from occurring on a “fast cycle” production line

　　(B) the strategy of “fast cycle time” would require fundamental rethinking of product design

　　(C) the primary goal of the organization is to produce a product of unexcelled quality, rather than to generate profits for stockholders

　　(D) “fast cycle time” could be achieved by shaving time off each of the component processes in production cycle

　　(E) “fast cycle time” is a concept in business strategy that has not yet been put into practice in a factory

　　7. Many breakfast cereals are fortified with vitamin supplements. Some of these cereals provide 100 percent of the recommended daily requirement of vitamins. Nevertheless, a well-balanced breakfast, including a variety of foods, is a better source of those vitamins than are such fortified breakfast cereals alone.Which of the following, if true, would most strongly support the position above?

　　(A) In many foods, the natural combination of vitamins with other nutrients makes those vitamins more usable by the body than are vitamins added in vitamin supplements.

　　(B) People who regularly eat cereals fortified with vitamin supplements sometimes neglect to eat the foods in which the vitamins occur naturally.

　　(C) Foods often must be fortified with vitamin supplements because naturally occurring vitamins are removed during processing.

　　(D) Unprocessed cereals are naturally high in several of the vitamins that are usually added to fortified breakfast cereals.

　　(E) Cereals containing vitamin supplements are no harder to digest than similar cereals without added vitamins.

　　8. Which of the following best completes the passage below?The more worried investors are about losing their money, the more they will demand a high potential return on their investment; great risks must be offset by the chance of great rewards. This principle is the fundamental one in determining interest rates, and it is illustrated by the fact that______

　　(A) successful investors are distinguished by an ability to make very risky investments without worrying about their money

　　(B) lenders receive higher interest rates on unsecured loans than on loans backed by collateral

　　(C) in times of high inflation, the interest paid to depositors by banks can actually be below the rate of inflation

　　(D) at any one time, a commercial bank will have a single rate of interest that it will expect all of its individual borrowers to pay

　　(E) the potential return on investment in a new company is typically lower than the potential return on investment in a well-established company

　　9. A famous singer recently won a lawsuit against an advertising firm for using another singer in a commercial to evoke the famous singer’s well-known rendition of a certain song. As a result of the lawsuit, advertising firms will stop using imitators in commercials. Therefore, advertising costs will rise, since famous singers’ services cost more than those of their imitators.The conclusion above is based on which of the following assumptions?

　　(A) Most people are unable to distinguish a famous singer’s rendition of a song from a good imitator’s rendition of the same song.

　　(B) Commercials using famous singers are usually more effective than commercials using imitators of famous singers.

　　(C) The original versions of some well-known songs are unavailable for use in commercials.

　　(D) Advertising firms will continue to use imitators to mimic the physical mannerisms of famous singers.

　　(E) The advertising industry will use well-known renditions of songs in commercials.

　　10. A certain mayor has proposed a fee of five dollars per day on private vehicles entering the city, claiming that the fee will alleviate the city’s traffic congestion. The mayor reasons that, since the fee will exceed the cost of round-trip bus fare from many nearby points, many people will switch from using their cars to using the bus.Which of the following statements, if true, provides the best evidence that the mayor’s reasoning is flawed?

　　(A) Projected increases in the price of gasoline will increase the cost of taking a private vehicle into the city.

　　(B) The cost of parking fees already makes it considerably more expensive for most people to take a private vehicle into the city than to take a bus.

　　(C) Most of the people currently riding the bus do not own private vehicles.

　　(D) Many commuters opposing the mayor’s plan have indicated that they would rather endure traffic congestion than pay a five-dollar-per day fee.

　　(E) During the average workday, private vehicles owned and operated by people living within the city account for twenty percent of the city’s traffic congestion.

　　11. A group of children of various ages was read stories in which people caused harm, some of those people doing so intentionally, and some accidentally. When asked about appropriate punishments for those who had caused harm, the younger children, unlike the older ones, assigned punishments that did not vary according to whether the harm was done intentionally or accidentally. Younger children, then, do not regard people’s intentions as relevant to punishment.Which of the following, if true, would most seriously weaken the conclusion above?

　　(A) In interpreting these stories, the listeners had to draw on a relatively mature sense of human psychology in order to tell whether harm was produced intentionally or accidentally.

　　(B) In these stories, the severity of the harm produced was clearly stated.

　　(C) Younger children are as likely to produce harm unintentionally as are older children.

　　(D) The older children assigned punishment in a way that closely resembled the way adults had assigned punishment in a similar experiment.

　　(E) The younger children assigned punishments that varied according to the severity of the harm done by the agents in the stories.

　　12. When hypnotized subjects are told that they are deaf and are then asked whether they can hear the hypnotist, they reply, “No.” Some theorists try to explain this result by arguing that the selves of hypnotized subjects are dissociated into separate parts, and that the part that is deaf is dissociated from the part that replies.Which of the following challenges indicates the most serious weakness in the attempted explanation described above?

　　(A) Why does the part that replies not answer, “Yes”?

　　(B) Why are the observed facts in need of any special explanation?

　　(C) Why do the subjects appear to accept the hypnotist’s suggestion that they are deaf?

　　(D) Why do hypnotized subjects all respond the same way in the situation described?

　　(E) Why are the separate parts of the self the same for all subjects?

　　Questions 13-14 are based on the following.

　　The program to control the entry of illegal drugs into the country was a failure in 1987. If the program had been successful, the wholesale price of most illegal drugs would not have dropped substantially in 1987.

　　13. The argument in the passage depends on which of the following assumptions?

　　(A) The supply of illegal drugs dropped substantially in 1987.

　　(B) The price paid for most illegal drugs by the average consumer did not drop substantially in 1987.

　　(C) Domestic production of illegal drugs increased at a higher rate than did the entry of such drugs into the country.

　　(D) The wholesale price of a few illegal drugs increased substantially in 1987.

　　(E) A drop in demand for most illegal drugs in 1987 was not the sole cause of the drop in their wholesale price.

　　14. The argument in the passage would be most seriously weakened if it were true that

　　(A) in 1987 smugglers of illegal drugs, as a group, had significantly more funds at their disposal than did the country’s customs agents

　　(B) domestic production of illegal drugs increased substantially in 1987

　　(C) the author’s statements were made in order to embarrass the officials responsible for the drug-control program

　　(D) in 1987 illegal drugs entered the country by a different set of routes than they did in 1986

　　(E) the country’s citizens spent substantially more money on illegal drugs in 1987 than they did in 1986

　　15. Excavation of the ancient city of Kourion on the island of Cyprus revealed a pattern of debris and collapsed buildings typical of towns devastated by earthquakes. Archaeologists have hypothesized that the destruction was due to a major earthquake known to have occurred near the island in A.D. 365.Which of the following, if true, most strongly supports the archaeologists’ hypothesis?

　　(A) Bronze ceremonial drinking vessels that are often found in graves dating from years preceding and following A.D. 365 were also found in several graves near Kourion.

　　(B) No coins minted after A.D. 365 were found in Kourion, but coins minted before that year were found in abundance.

　　(C) Most modern histories of Cyprus mention that an earthquake occurred near the island in A.D. 365.

　　(D) Several small statues carved in styles current in Cyprus in the century between A.D. 300 and 400 were found in Kourion.

　　(E) Stone inscriptions in a form of the Greek alphabet that was definitely used in Cyprus after A.D. 365 were found in Kourion.

　　16. Sales of telephones have increased dramatically over the last year. In order to take advantage of this increase, Mammoth Industries plans to expand production of its own model of telephone, while continuing its already very extensive advertising of this product.Which of the following, if true, provides most support for the view that Mammoth Industries cannot increase its sales of telephones by adopting the plan outlined above?

　　(A) Although it sells all of the telephones that it produces, Mammoth Industries’ share of all telephone sales has declined over the last year.

　　(B) Mammoth Industries’ average inventory of telephones awaiting shipment to retailers has declined slightly over the last year.

　　(C) Advertising has made the brand name of Mammoth Industries’ telephones widely known, but few consumers know that Mammoth Industries owns this brand.

　　(D) Mammoth Industries’ telephone is one of three brands of telephone that have together accounted for the bulk of the last year’s increase in sales.

　　(E) Despite a slight decline in the retail price, sales of Mammoth Industries’ telephones have fallen in the last year.

　　17. Many institutions of higher education suffer declining enrollments during periods of economic slowdown. At two-year community colleges, however, enrollment figures boom during these periods when many people have less money and there is more competition for jobs.Each of the following, if true, helps to explain the enrollment increases in two-year community colleges described above EXCEPT:

　　(A) During periods of economic slowdown, two-year community colleges are more likely than four-year colleges to prepare their students for the jobs that are still available.

　　(B) During periods of economic prosperity, graduates of two-year community colleges often continue their studies at four-year colleges.

　　(C) Tuition at most two-year community colleges is a fraction of that at four-year colleges.

　　(D) Two-year community colleges devote more resources than do other colleges to attracting those students especially affected by economic slowdowns.

　　(E) Students at two-year community colleges, but not those at most four-year colleges, can control the cost of their studies by choosing the number of courses they take each term.

　　Questions 18-19 are based on the following.

　　Hardin argued that grazing land held in common (that is, open to any user) would always be used less carefully than private grazing land. Each rancher would be tempted to overuse common land because the benefits would accrue to the individual, while the costs of reduced land quality that results from overuse would be spread among all users. But a study comparing 217 million acres of common grazing land with 433 million acres of private grazing land showed that the common land was in better condition.

　　18. The answer to which of the following questions would be most useful in evaluating the significance, in relation to Hardin’s claim, of the study described above?

　　(A) Did any of the ranchers whose land was studied use both common and private land?

　　(B) Did the ranchers whose land was studied tend to prefer using common land over using private land for grazing?

　　(C) Was the private land that was studied of comparable quality to the common land before either was used for grazing?

　　(D) Were the users of the common land that was studied at least as prosperous as the users of the private land?

　　(E) Were there any owners of herds who used only common land, and no private land, for grazing?

　　19. Which of the following, if true, and known by the ranchers, would best help explain the results of the study?

　　(A) With private grazing land, both the costs and the benefits of overuse fall to the individual user.

　　(B) The cost in reduced land quality that is attributable to any individual user is less easily measured with common land than it is with private land.

　　(C) An individual who overuses common grazing land might be able to achieve higher returns than other users can, with the result that he or she would obtain a competitive advantage.

　　(D) If one user of common land overuses it even slightly, the other users are likely to do so even more, with the consequence that the costs to each user outweigh the benefits.

　　(E) There are more acres of grazing land held privately than there are held in common.

　　20. In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.Which of the following, if true, gives the most support to the recommendation above?

　　(A) The accepted treatment for pironoma does not have damaging side effects.

　　(B) The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma.

　　(C) In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.

　　(D) The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma.

　　(E) All laboratory tests to detect pironoma have the same proportion of false negative results.

　　参考答案:

　　1. E2. A3. B4. D5. C

　　6. A7. A8. B9. E10. B

　　11. A12. A13. E14. B15. B

　　16. E17. B18. C19. D20. E