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Unlike the wholesale price of raw wool, the wholesale price of raw cotton has fallen considerably in the last year.  Thus, although the retail price of cotton clothing at retail clothing stores has not yet fallen, it will inevitably fall.
Which of the following, if true, most seriously weakens the argument above?
(A) The cost of processing raw cotton for cloth has increased during the last year.
(B) The wholesale price of raw wool is typically higher than that of the same volume of raw cotton.
(C) The operating costs of the average retail clothing store have remained constant during the last year.
(D) Changes in retail prices always lag behind changes in wholesale prices.
(E) The cost of harvesting raw cotton has increased in the last year.
答案为A。注意E选项错误的原因是cost of harvesting显然已经包括在原文中的wholesale price of raw cotton中了。

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By competing with rodents for seeds, black ants help control rodent populations that pose a public health risk.  However, a very aggressive species of blank ant, the Loma ant, which has recently invaded a certain region, has a venomous sting that is often fatal to humans.  Therefore, the planned introduction into that region of ant flies, which prey on Loma ants, would benefit public health.
Which of the following, if true, most strengthens the argument?
(A)Ant flies do not attack black ants other than Loma ants.
(B)Loma ants are less effective than many bird species in competing with rodents for seeds.
(C)Certain other species of black ants are more effective than Loma ants in competing with rodents for seeds.
(D)The sting of Loma ants can also be fatal to rodents
(E)The use of pesticides to control Loma ants could have harmful effects on the environment.
答案为A。注意本文讨论的是introduction of ant flies是否可以benefit public health，而B选项讨论的内容与此关系不紧密。

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The average hourly wage of television assemblers in Vernland has long been significantly lower than that in neighboring Borodia.  Since Borodia dropped all tariffs on Vernlandian televisions three years ago, the number of televisions sold annually in Borodia has not changed.  However, recent statistics show a drop in the number of television assemblers in Borodia.  Therefore, updated trade statistics will probably indicate that the number of televisions Borodia imports annually from Vernland has increased.
Which of the following is an assumption on which the argument depends?
(A)The number of television assemblers in Vernland has increased by at least as much as the number of television assemblers in Borodia has decreased.
(B)Televisions assembled in Vernland have features that televisions assembled in Borodia do not have.
(C)The average number of hours it takes a Borodian television assembler to assemble a television has not decreased significantly during the past three years.
(D)The number of televisions assembled annually in Vernland has increased significantly during the past three years.
(E)The difference between the hourly wage of television assemblers in Vernland and the hourly wage of television assemblers in Borodia is likely to decrease in the next few years.
答案为C。本题为涉及简单数学关系的题目，你考虑时仔细想清楚即可。

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Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria.  Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria.
The statements above, if true, provide the most support for which of the following conclusions?
A.        Mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way.
B.        Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections.
C.        In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.
D.        When a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouse’s body decreases.
E.        Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection.
答案为C。根据原文最后一句，macrophage level和nitrate level之间存在正相关关系，而C选项表达的恰好是该意思。

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Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.
Which of the following ,if true, most helps to confirm the explanation above?
A.        Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges
B.        Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
C.        After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young
D.        Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards.
E.        The boreal owl requires less food, relative to its weight, than is required by members of other owl species.
答案为B。注意题目让你加强的是explanation，即large range是由于scarce food导致的。选项A与此无关，且包含自杀词。

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In Kravonia, the average salary for jobs requiring a college degree has always been higher than the average salary for jobs that do not require a degree. Current enrollments in Kravonia’s colleges indicate that over the next four years the percentage of the Kravonian workforce with college degree will increase dramatically. Therefore, the average salary for all workers in Kravonia is likely to increase over the next four years.
Which of the following is an assumption on which the argument depends?
A. Kravonians with more than one college degree earn more, on average, than do Kravonians with only one college degree.
B. The percentage of Kravonians who attend college in order to earn higher salaries is higher now than it was several years ago.
C. The higher average salary for jobs requiring a college degree is not due largely to a scarcity among the Kravonian workforce of people with a college degree.
D. The average salary in Kravonia for jobs that do not require a college degree will not increase over the next four years.
E. Few members of the Kravonian workforce earned their degrees in other countries.
答案为C。本题考查了一个最简单也是最常考的经济学常识——“物以稀为贵”（供求关系决定价格）

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In Kantovia, physicians’ income comes from insurance companies, which require physicians to document their decisions in treating patients and to justify deviations from the companies’ treatment guidelines. Ten years ago physicians were allowed more discretion. Most physicians believe that the companies’ requirements now prevent them from spending enough time with patients. Yet the average amount of time a patient spends with a physician during an office visit has actually increased somewhat over the last ten years.
Which of the following, if true, most helps to resolve the apparent discrepancy between physicians’ perceptions and the change in the actual time spent?
A.        Patients are more likely to be in a hurry nowadays and are less willing to wait a long time to see their physician.
B.        Physicians today typically have a wider range of options in diagnosis and treatment to consider with the patient before prescribing.
C.        Physicians are increasingly likely to work in group practices, sharing the responsibility of night and weekend work.
D.        Most patients would rather trust their physicians than their insurance companies to make decisions about their treatment.
E.        Since the insurance companies pay physicians a set amount for each office visit, it is to physicians’ financial advantage to see as many patients as possible.
答案为B。正确解决本题的关键就是理解文章第一句话——永远记住逻辑题的核心就是用原文前面内容回答后面问题。

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Microscopic plants called algae grow inside the top layer of sea ice in the Antarctic if enough sunlight reaches that layer of ice and enough seawater, which contains nutrients, reaches that layer after splashing onto the surface.  Even though moderate snow cover reduces the sunlight that filters into the top layer, sea ice with moderate snow cover typically contains even more algae in the top layer than does sea ice with less snow cover.
Which of the following, if true, most helps to explain the apparent discrepancy?
(A) As the weight of accumulated snow forces ice lower in the water, more seawater splashes onto the surface and seeps through the snow.
(B) Seawater in the Antarctic often contains higher concentrations of nutrients than does seawater in more temperate regions.
(C) As the air temperature around sea ice decreases during the winter, the likelihood decreases that snow will fall and thus add to any existing snow cover.
(D) The nutrients on which algae rely are common in seawater throughout the Antarctic.
(E) More sunlight filters through a layer of ice than through an equally thick layer of snow.
答案为A。正确解决本题的关键就是理解文章第一句话——永远记住逻辑题的核心就是用原文前面内容回答后面问题。

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During the month of May, crabs arrive on Delaware’s beaches to lay eggs.  Certain shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds.  Delaware’s crab population has declined recently.  This decline, however, poses no serious threat to the migrating shorebird populations:  by remaining longer in Delaware, the birds will be able to eat enough crab eggs to allow them to complete their migration.
Which of the following, if true, most seriously weakens the argument?
A.        No other food available to the birds on Delaware’s beaches is as nutritious and accessible as are crab eggs.
B.        The decline in the number of crabs on Delaware’s beaches is due to the harvesting of crabs by humans.
C.        There are more crabs on Delaware’s beaches than in any other area that the migrating birds pass through.
D.        The crabs do not conceal their eggs.
E.        The earlier in the season the shorebirds complete their migration, the more likely they are to breed successfully.
答案为E。关键是理解原文Certain shorebird这句话——永远记住逻辑题的核心就是用原文前面内容回答后面问题。

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On the whole, scientists do their most creative work before age forty, a tendency that has been taken to show that aging carries with it a loss of creative capacity.  An alternative explanation is that by age forty most scientists have worked in their field for fifteen or more years and that by then they have exhausted the opportunity for creative work in that field.  Supporting this explanation is the finding that ______.
A.        the average age of recipients of scientific research grants is significantly greater than forty
B.        a disproportionately large number of the scientists who produce highly creative work beyond age forty entered their field at an older age than is common
C.        many scientists temper their own expectations of what they can achieve in their research work by their belief that their creativity will decline as they age
D.        scientists who are older than forty tend to find more satisfaction in other activities, such as teaching and mentoring, than they do in pursuing their own research
E.        there is a similar diminution of creativity with age in nonscientific fields, such as poetry and musical composition
答案为B。注意原文让你加强的其实就是An alternative explanation这句话。B选项很复杂故很可能正确。