2015年10月GRE逻辑预测机经首发版
对于大部分备考GRE考试的考生来说，如果对GRE机经有很好的把握，那么在今后的考试中考生能够更加轻而易举的获得不错的成绩。以下是2015年10月GRE逻辑预测机经首发版，主要适用于2015年10月GRE考试，稍后有细致版推出。
20150829
Upon maturity, monarch butterflies travel hundreds of miles from their places of origin and lay their eggs on milkweed. The caterpillars that emerge feed on milkweed and absorb the glycosides in milkweed sap. The specific glycosides present in milkweed differ from region to region within the monarch butterfly’s range. Mature butterflies retain the glycosides in a mature monarch butterfly could be used to determine its place of origin.
Which of the following, if true, most strengthens the argument?
A. Mature monarch butterflies do not feed on parts of milkweed that contain glycosides.
B. The glycosides in milkweed sap are slightly toxic to caterpillars of other species.
C. The vast majority of the monarch butterflies that are laying eggs in a given region will have traveled there from a single region.
D. There are substances other than glycosides in milkweed sap that accumulate in a monarch caterpillar and are retained in the body of the mature butterfly.
E. There are certain glycosides that are found in the sap of all milkweeds, no matter
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where they grow within the monarch butterfly’s range.
答案：C
只有C 选项是加强了上文的论点。
20150821
A cave in Central America was occupied by humans for much of the period from 9,000 to 500 years ago. Archaeological excavations in the cave have discovered remains of food plants at every level of habitation, increasing from fewer than ten food plant species in the earliest (lowest) levels to over 30 species in the latest levels. Clearly, later inhabitants of the cave used a greater variety of plants as food than earlier inhabitants did.
Which of the following, if true of the cave, most weakens the argument?
(A) Some of the plant species found in the earlier (lower) levels of habitation are not found at all in the later (upper) levels of habitation.
(B) The remains of some plant species, such as squash and chili peppers, show changes from the middle to the later (upper) levels that indicate domestication.
(C) At certain points during the period from 9,000 to 500 years ago, the cave was abandoned for a time and later reoccupied by people who were probably of a different culture than the earlier inhabitants
(D) Virtually all the plant remains found at earliest (lowest) levels of habitation are tough fibers that are relatively resistant to decomposition.
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(E) The total volume of food plant remains found in the earlier (lower) layers was greater than that found in the later (upper) layers.
参考答案：D
文本大意为：中美洲的一个洞穴在之前的9000 至500 年间，有人类居住。考古学家发现其中不同时期遗留下的食物类植物。其中早期的有不到十种，后期有超过三十种。显然，后期居住者的食物种类更多。
题目要求选择一个选项，削弱文本论证。选项D 符合：发现的早期食物几乎都是不容易被分解的茎类植物。也就是说，其他类型的食物可能因年代久远都已经被分解了，考古学家无法发现，故无法判断前期食物种类就比后期少。
20150710
Avionics is a portmanteau word meaning “aviation electronics.”It is a term that hasevolved over the last 40 years as airplane instrumentation has evolved from mostlymechanical to largely electronic. Today, avionics makes up the large part of the cost of any aircraft. Guidance and navigation systems are integrated. Communications includes public address systems for communicating with passengers, intercoms for communicating with flight crews, and radio or SatCom for communicating with ground personnel. In addition, planes today have weather radar, lightning detectors, automatic flight control systems, and collision-avoidance systems. All of these systems must work in tandem in order for the plane to fly.
Select one answer choice.
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Which of the following inferences about avionics is best supported bythe passage?
(A) Within a decade, passenger planes will take off and land without human intervention.
(B) Soon passenger planes will include features that now appear only on military planes.
(C) Just 40 years ago, there were no electronic devices on passenger airplanes.
(D) As avionics becomes more common, the cost of manufacturing planes will decrease.
(E) A glitch in a plane's electrical system may be the greatest danger in flight today.
参考答案：E. 文章大意：航空设备在过去40 年的发展过程中，逐渐由大部分为航空机械设备发展成大部分为航空电子设备。故如果出现电子差错，可能导致大的危险，E 选项正确。
20150705
Many shipwrecks dating from the period between A.D. 300 and 600 have been discovered in the Ramian Sea. Well over half of those ships were carrying cargo stored in large ceramic jars, many of which were preserved largely intact on the ocean floor. During that period, such jars carried only liquid. Therefore, liquid cargo was probably carried by a majority of the cargo ships that navigated the Ramian Sea during that period.
文章大意：很多公元前300 至600 年的遇难船只在Ramian 海域被发现。一半以上的船运载的是装在陶瓷罐里的货品。这些大部分在海底保存完好。在那个时期，这种罐子只装液体。因此，地址：北京市海淀区海淀北二街8号中关村SOHO A区2层
当时航行在Ramian 海域的大部分货船运送的是液体货物。
The force of the evidence cites in the passage is most seriously weakened if which of the following is true?
A.For ships on the Ramian Sea during the period, a full load of liquid cargo stored in large ceramic jars was not likely to be significantly heavier than a full load of other kinds of cargo that were typical of the period.
B.There are no surviving records dating from the period that detail specific cargoes shipped across the Ramian Sea.
C.The ratio of liquid to solid cargo shipped across the Ramian Sea did not vary significantly over the period.
D.The presence of a sizable quantity of large ceramic jars on the ocean floor is so visually striking that a shipwreck of a ship carrying such jars is more likely to be noticed and reported than are shipwrecks of ships carrying other cargoes.
E.During the period, grain and other solid cargo was shipped across the Ramian Sea in containers made from material other than clay.
参考答案：D 载有陶瓷罐的遇难船只比装有其他货品的遇难船只更容易被人发现。由此会弱化大部分船只装在液体的结论。
201506
The Canadian elk has traditionally been limited in its geographic range by the presence 地址：北京市海淀区海淀北二街8号中关村SOHO A区2层
of elderberries, its primary source of food, which only grow up until a certain point in the tundra. A recent rise in temperatures, however, has seen a spread in the growth of elderberries northwards into the tundra. Therefore, the overall range of the Canadian elk can be expected to increase.
Which of the following, if true, best casts doubt on the argument?
A. In addition to elderberry, the Canadian elk also consumes loganberries, which are expected to also begin growing at more northerly latitudes.
B. During the summer months, many Canadian elk are hunted both for sport and for their meat.
C. The grizzly bear, the Canadian elk’s primary predator, has also started moving north into the tundra.
D. The permafrost, the region above the tundra, in which the temperatures never reach above freezing, will unlikely see elderberry growth.
E. Increasing temperatures have created conditions too warm for elderberry growth in the southern half of the Canadian elk’s traditional territory.
答案：E。E 选项表明在elk 的传统生活领域，elderberry 因为天气原因不再生长，故Canadian elk 的生活区域将会北移，而不会扩大。
201505
After examining the bodies of a dozen beached whales and finding evidence of
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bleeding around the animals’eyes and brains as well as lesions on their kidneys and livers, environmental groups fear that the Navy’s use of sonar is causing serious harm to marine animals. A leading marine biologist reports that sonar induces whales to panic and surface too quickly, which causes nitrogen bubbles to form in their blood.
The argument above relies on which of the following assumptions?
A.Marine biologists have documented chat other marine animals, including dolphins and seaturtles, have exhibit kidney and liver lesions.
B.No studies have been conducted on the possible detrimental effects of sonar on marine animals.
C.Whales in captivity panic only when exposed to man-made, rather than natural, sound waves.
D.The presence of nitrogen bubbles in the blood has been demonstrated to cause damage to various internal organs.
参考答案：E.
20150425
The bodies of dwarf individuals of mammalian species are generally smaller in relation to those of nondwarf individuals than are the teeth of the dwarf individuals in relation to those of the nondwarf indi- viduals. Fragmentary skeletal remains of an adult dwarf woolly mammoth were recently found. The teeth are three-fourths the size of the teeth of an
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average adult nondwarf woolly mammoth.
The statements above, if true, most strongly support which of the following?
(A)The body of the dwarf woolly mammoth was less than three-fourths the size of the body of an average adult nondwarf woolly mammoth.
(B)None of the teeth of the dwarf woolly mammoth that were recently discovered was as large as any of the teeth of nondwarf woolly mammoths that have been discovered.
(C)The teeth of most adult dwarf individuals of mammalian species are three- fourths the size of the teeth of the adult nondwarf individuals of the same species.
(D)Dwarf woolly mammoths had the same number of teeth as did nondwarf woolly mammoths.
(E)Dwarf individuals of most mammalian species are generally no more than
three-fourths the size of the adult nondwarf individuals of those species.
20150411
1. Editorial:
About 20 percent of professors at Torellia National University were not educated in Torellia. The average pay of professors at the university who were educated in Torellia is about 10 percent lower than that of professors with comparable levels of training and experience who were educated outside Torellia. These figures clearly indicate the existence of a university policy, though probably an unwritten one, of favoring foreign-educated
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professors over those educated in Torellia when determining salaries
Which of the following, if true,most seriously undermines the editorial’s conclusion ?
(A) The salaries of professors at the university are increasing more slowly than the salaries of people with comparable levels of training and experience employed by corporations.
(B) The business school of the university, where most of the professors who were educated outside Torellia teach, must pay high salaries to its faculty to compete with salaries available to them from corporations.
(C )The benefits other than salary offered to the university’s professors are about the same for professors educated in Torellia as for those not educated in Torellia.
(D) The university has an explicit policy setting broad salary ranges for professors at all levels of experience.
(E )Most of the professors at the university who were educated outside Torellia are native-born citizens of Torellia.
2. In the last few years, a drastic spike in sea temperatures around Prudhoe Bay has caused the eggs of snow crabs to hatch earlier in the year than they had previously. As a result, baby snow crabs are more likely to be caught by deep sea fishing boats, since deep sea fishing boats are more numerous in Arctic waters during the fall season than they are during the winter season.
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Which of the following pieces of information is necessary to evaluate the argument?
(A) The total number of snow crabs that hatch versus the total number that had hatched before the increase in temperatures
(B) The time of year the deep sea fishing boats arrive to the waters around Prudhoe Bay
(C) The month in which the boats leave, and the month in which the snow crabs eggs hatch
(D) The amount of area the fisherman’s nets can cover in one day
(E) The amount of time the deep sea fishing boats spend in water directly above where the snow crabs are likely to hatch
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