gre考试真题题库及解析六.doc
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1、In order to solve a burglary that has taken place at the Marshalls house,Detective Johnson has been instructed to search exactly seven locationsthe foyer, the kitchen, the living room, the guest room, the hallway, the musicroom, and the nursery. The foyer, kitchen, and living room are locateddownsta
2、irs, whereas the guest room, hallway, music room, and nursery are locatedupstairs. During the first visit to search for evidence, Detective Johnson hastime to search exactly three locations. This search must be conducted accordingto the following conditions:The three locations searched must be neith
3、er all upstairs nor all downstairs.If the hallway is searched, then the foyer must also be searched.If the music room is not searched, then the guest room cannot be searched.The kitchen and the living room cannot both be searched.The three locations searched must include the living room or the nurse
4、ry, or both.Which of the following is a selection of locations that conforms to theconditions for Detective Johnsons first visit?Foyer, guest room, hallwayFoyer, hallway, living roomFoyer, kitchen, living roomGuest room, hallway, kitchenGuest room, music room, nursery答案:(B)During the first visit, if
5、 the kitchen is searched, which of the followingmust also be searched?The foyerThe guest roomThe hallwayThe music roomThe nursery答案:(E)During the first visit, if the music room is searched, which of the followingis a pair of locations that can both also be searched?The foyer and the hallwayThe guest
6、 room and the kitchenThe hallway and the living roomThe kitchen and the living roomThe kitchen and the nursery答案:(E)During the first visit, if the guest room is searched, which of the followingmust also be searched? The foyer The hallway The kitchen The living room The nursery答案:(D)During the first
7、visit, if the kitchen is the only downstairs locationsearched, which of the following must also be searched?The music room and the nurseryThe hallway and the nurseryThe hallway and the music roomThe guest room and the nurseryThe guest room and the music room答案:(A)During the first visit, if the livin
8、g room is not searched, which of thefollowing is a pair of locations that can both be searched?The foyer and the guest roomThe hallway and the kitchenThe foyer and the music roomThe hallway and the music roomThe guest room and the kitchen答案:(C)The presence of microorganisms that produce a toxin caus
9、es seawater to turnbrownish red, a phenomenon known as a red tide. Sea otters do not feed in areaswhere clams, their main source of food, have become contaminated with thistoxin. According to a proposed explanation of the otters behavior, the otterssample the clams in a potential feeding area and ca
10、n taste any toxin in them.Which of the following, if true, would most strongly indicate that thehypothesis described in the last sentence of the passage is not correct?In some of the areas where red tides occur, neither clams nor sea otters areindigenous species.The presence of sea otters in a given
11、 area has a significant effect on whichother marine organisms are to be found in that area.When seawater in an area unaffected by red tide is artificially dyed brownishred, sea otters do not feed on the clams in that area.If the clams in a given area are contaminated with toxins, sea otters move too
12、ther areas in search of food.Although very small amounts of the toxin produced during a red tide are notharmful, large doses can be fatal to animals the size of sea otters.答案:(C)问题:下面哪一个,if true,最强烈地指出上文最后一句话所描述的假设是不正确的读题:产生一种毒质的微生物的存在引起海水变为褐红色,我们称之为红潮的现象。海濑不吃被毒素污染的clam, clam是它们的主要事物来源。按照海濑行为的某种解释,
13、海濑抽样检查clam ,并且能够尝出任何有毒物质分析:原文是一个现象:海濑不吃被毒素污染的clam一个解释:海濑抽样检查clam ,并且能够尝出任何有毒物质问题是要反对,答案形式一般为:1、有其他的原因来解释上面这个现象C. 在没有被红潮污染的海水人为地染成褐红色, 海濑不吃那个区域的clam(恰恰说明海濑根据颜色来判断,而并不是抽样检查,尝出毒素,反对了原来的解释)D. 如果某一区域中的clam 被毒素污染了, sea otter移动到其它地方寻求食物(clam被污染,就不吃,与原文解释观点相同,作为SUPPORT)An acre of average farmland produces o
14、nly about 400 pounds of grain amaranth,as against 2,400 pounds per acre, or six times as much, for wheat. It followsthat whenever the grain-amaranth price is projected to be more than six timesthe projected price of wheat, farmers wishing to maximize profits will growgrain amaranth rather than wheat
15、.The argument above is based on which of the following assumptions?An acres worth of grain amaranth is no more expensive to grow and bring tomarket than an acres worth of wheat.There is no crop that produces a higher yield in terms of pounds harvestedper acre than wheat.By choosing which crops to gr
16、ow, farmers can exert a significant influence onthe prices of those crops.Farmers are no less motivated by the desire to maximize profits than areother occupational groups.Prices of grain crops can change faster than farmers can change the acreagedevoted to various grain crops.答案:(A)问题:上文的论述基于下面哪一个A
17、SSUMPTION?读题:一亩地平均只生产400磅的ga, 比较起来每亩生产2400磅小麦. 因此,当ga的价格预测大于小麦价格的六倍时,农民为获取更大的利益将种植ga而不是小麦分析:上文原因是:ga产量是小麦产量的1/6 结论是: 只有价格ga是小麦6倍的时候,才种植ga而不是小麦这是GRE中典型的数字推理,必须基于一个假设:没有其他的因素来影响找具有否定词的选项(A,B,D)A. 种植和运输到市场, 一亩ga不比一亩小麦贵(指出没有种植和运输的因素需要考虑)B. 没有一种作物比小麦有更高的产量Most road repairs require more time and money tha
18、n is budgeted, but lastsummers nighttime repairs of Highway 93 and similar roads required no more timeor money than had been budgeted. Therefore, making summer repairs to majorroads at night would save both time and money.Which of the following, if true, most strongly supports the conclusion drawnab
19、ove?The smaller number of cars on the roads at night and more comfortablenighttime temperatures allow road workers to work more quickly.Road repair crews that work at night mark their work sites with brighthashing lights in addition to the orange cones they use during the daytime.The budget for the
20、repairs to Highway 93 was generous enough to make itunlikely that it would be exceeded.Road workers who are willing to work at night have an easier time findingjobs, since most people would rather work in the daytime.Asphalt used in road repair tends to expand in warmer temperatures andcontract in c
21、ooler temperatures.答案:(A)Exactly seven childrenR, S, T, V, W, X, and Yare to be divided into two studygroups, group 1 and group 2. Group 1 must have three members, and group 2 musthave four members. The children are being assigned to groups according to thefollowing conditions:R cannot be in the sam
22、e group as TIf S is in group 1, V must be in group 1.If W is in group 1, T must be in group 2.X must be in group 2.Which of the following is an acceptable assignment of the children to the twogroups? Group 1 Group 2R, S, Y T, V, W, XR, T, V S, W, X, YT, V, X R, S, W, YT, V, Y R, S, W, XT, W, Y R, S,
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