2012GMAT逻辑推理训练内容希望考生充分利用，总结做题技巧，充分备考。
The recent decline in land prices has hurt many institutions that had invested heavily in real estate. Last year, before the decline began, a local college added 2,000 acres to its holdings. The college, however, did not purchase the land but received it as a gift. Therefore the price decline will probably not affect the college.
Which of the following, if true, casts most doubt on the conclusion above?
(A) The 2,000 acres that the college was given last year are located within the same community as the college itself.
(B) The college usually receives more contributions of money than of real estate.
(C) Land prices in the region in which the college is located are currently higher than the national average.
(D) Last year, the amount that the college allocated to pay for renovations included money it expected to receive by selling some of its land this year.(D)
(E) Last year, the college paid no property taxes on land occupied by college buildings but instead paid fees to compensate the local government for services provided.
Normally, increases in the price of a product decrease its sales except when the price increase accompanies an improvement in the product. Wine is unusual, however. Often increases in the price of a particular producer's wine will result in increased sales, even when the wine itself is unchanged.
Which of the following, if true, does most to explain the anomaly described above?
(A) The retail wine market is characterized by an extremely wide range of competing products.
(B) Many consumers make decisions about which wines to purchase on the basis of reviews of wine published in books and periodicals.
(C) Consumers selecting wine in a store often use the price charged as their main guide to the wine's quality.
(D) Wine retailers and producers can generally increase the sales of a particular wine temporarily by introducing a price discount.(C)
(E) Consumers who purchase wine regularly generally have strong opinions about which wines they prefer.
Some species of dolphins find their prey by echolocation; they emit clicking sounds and listen for echoes returning from distant objects in the water. Marine biologists have speculated that those same clicking sounds might have a second function: particularly loud clicks might be used by the dolphins to stun their prey at close range through sensory overload.
Which of the following, if discovered to be true, would cast the most serious doubt on the correctness of the speculation described above?
(A) Dolphins that use echolocation to locate distant prey also emit frequent clicks at intermediate distances as they close in on their prey.
(B) The usefulness of echolocation as a means of locating prey depends on the clicking sounds being of a type that the prey is incapable of perceiving, regardless of volume.
(C) If dolphins stun their prey, the effect is bound to be so temporary that stunning from far away, even if possible, would be ineffective.
(D) Echolocation appears to give dolphins that use it information about the richness of a source of food as well as about its direction.(B)
(E) The more distant a dolphin's prey, the louder the echolocation clicks must be if they are to reveal the prey's presence to the hunting dolphin.
Demographers doing research for an international economics newsletter claim that the average per capita income in the country of Kuptala is substantially lower than that in the country of Bahlton. They also claim, however, that whereas poverty is relatively rare in Kuptala, over half the population of Bahlton lives in extreme poverty. At least one of the demographers' claims must, therefore, be wrong.
The argument above is most vulnerable to which of the following criticisms?
(A) It rejects an empirical claim about the average per capita incomes in the two countries without making any attempt to discredit that claim by offering additional economic evidence.
(B) It treats the vague term "poverty" as though it had a precise and universally accepted meaning.
(C) It overlooks the possibility that the number of people in the two countries who live in poverty could be the same even though the percentages of the two populations that live in poverty differ markedly.
(D) It fails to show that wealth and poverty have the same social significance in Kuptala as in Bahlton.(E)
(E) It does not consider the possibility that incomes in Kuptala, unlike those in Bahlton, might all be very close to the country's average per capita income.
Civil trials often involve great complexities that are beyond the capacities of jurors to understand. As a result, jurors' decisions in such trials are frequently incorrect. Justice would therefore be better served if the more complex trials were decided by judges rather than juries.
The argument above depends on which of the following assumptions?
(A) A majority of civil trials involve complexities that jurors are not capable of understanding.
(B) The judges who would decide complex civil trials would be better able to understand the complexities of those trials than jurors are.
(C) The judges who would preside over civil trials would disallow the most complex sorts of evidence from being introduced into those trials.
(D) Jurors' decisions are frequently incorrect even in those civil trials that do not involve great complexities.(B)
(E) The sole reason in favor of having juries decide civil trials is the supposition that their decisions will almost always be correct.
上面是2012GMAT逻辑推理训练，希望对考生备考有所帮助。
