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。
Fresh potatoes generally cost about $2 for a 10-pound bag, whereas dehydrated instant potatoes cost, on average, about $3 per pound. It can be concluded that some consumers will pay 15 times as much for convenience, since sales of this convenience food continue to rise.
Which of the following, if true, indicates that there is a major flaw in the argument above?
(A) Fresh potatoes bought in convenient 2-pound bags are about $1 a bag, or 2 1/2 times more expensive than fresh potatoes bought in 10-pound bags.
(B) Since fresh potatoes are 80 percent water, one pound of dehydrated potatoes is the equivalent of 5 pounds of fresh potatoes.
(C) Peeled potatoes in cans are also more expensive than the less convenient fresh potatoes.
(D) Retail prices of dehydrated potatoes have declined by 20 percent since 1960 to the current level of about $3 a pound.(B)
(E) As a consequence of labor and processing costs, all convenience foods cost more than the basic foods from which they are derived.
Purebred cows native to Mongolia produce, on average, 400 liters of milk per year; if Mongolian cattle are crossbred with European breeds, the crossbred cows can produce, on average, 2,700 liters per year. An international agency plans to increase the profitability of Mongolia's dairy sector by encouraging widespread crossbreeding of native Mongolian cattle with European breeds.
Which of the following, if true, casts the most serious doubt on the viability of the agency's plan?
(A) Not all European breeds of cattle can be successfully bred with native Mongolian cattle.
(B) Many young Mongolians now regard cattle raising as a low-status occupation because it is less lucrative than other endeavors open to them.
(C) Mongolia's terrain is suitable for grazing native herds but not for growing the fodder needed to keep crossbred animals healthy.
(D) Cowhide and leather products, not milk, make up the bulk of Mongolia's animal product exports to Europe.(C)
(E) Many European breeds of cattle attain average milk production levels exceeding 2,700 liters.
Consumers in California seeking personal loans have fewer banks to turn to than do consumers elsewhere in the United States. This shortage of competition among banks explains why interest rates on personal loans in California are higher than in any other region of the United States.
Which of the following, if true, most substantially weakens the conclusion above?
(A) Because of the comparatively high wages they must pay to attract qualified workers, California banks charge depositors more than banks elsewhere do for many of the services they offer.
(B) Personal loans are riskier than other types of loans, such as home mortgage loans, that banks make.
(C) Since bank deposits in California are covered by the same type of insurance that guarantees bank deposits in other parts of the United States, they are no less secure than deposits elsewhere.
(D) The proportion of consumers who default on their personal loans is lower in California than in any other region of the United States.(A)
(E) Interest rates paid by California banks to depositors are lower than those paid by banks in other parts of the United States because in California there is less competition to attract depositors.
Technically a given category of insurance policy is underpriced if, over time, claims against it plus expenses associated with it exceed total income from premiums. But premium income can be invested and will then yield returns of its own. Therefore, an underpriced policy does not represent a net loss in every case.
The argument above is based on which of the following assumptions?
(A) No insurance policies are deliberately underpriced in order to attract customers to the insurance company offering such policies.
(B) A policy that represents a net loss to the insurance company is not an underpriced policy in every case.
(C) There are policies for which the level of claims per year can be predicted with great accuracy before premiums are set.
(D) The income earned by investing premium income is the most important determinant of an insurance company's profits.(E)
(E) The claims against at least some underpriced policies do not require paying out all of the premium income from those policies as soon as it is earned.
Which of the following best completes the passage below?
"Government" does not exist as an independent entity defining policy. Instead there exists a group of democratically elected pragmatists sensitive to the electorate, who establish policies that will result in their own reelection. Therefore, if public policy is hostile to, say, environmental concerns, it is not because of governmental perversity but because elected officials believe that______
(A) environmentalists would be extremely difficult to satisfy with any policy, however environmentally sound
(B) environmental concerns are being accommodated as well as public funds permit
(C) the public is overly anxious about environmental deterioration
(D) the majority of voters vote for certain politicians because of those politicians' idiosyncratic positions on policy issues(E)
(E) the majority of voters do not strongly wish for a different policy
上面是2012GMAT逻辑推理训练，希望对考生备考有所帮助。
