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《(2012)GMAT官方指南》 OG 12

《(2012)GMAT官方指南》是GMAC（GMAT考试命题机构）中国大陆的单家授权版本，是GMAT考试必备参考书。书中提供超过800道全真试题，涵盖GMAT考试所有题型，并配有全面的答案解析。题目按难易程度排列，帮助考生节省备考时间。 其中，OG12的CR部分共有 124 题，全部经由老师核对确认并标上题号及难度（根据官方标准划分）。

1 "Life expectancy" is the average age at death of the entire live-born population. In the middle of the nineteenth century, life expectancy in North America was 40 years, whereas now it is nearly 80 years. Thus, in those days, people must have been considered old at an age that we now consider the prime of life.Which of the following, if true, undermines the argument above?
2 Scientists propose placing seismic stations on the floor of the Pacific Ocean to warn threatened coastal communities on the northwestern coast of the United States of approaching tidal waves caused by earthquakes. Since forewarned communities could take steps to evacuate, many of the injuries and deaths that would otherwise occur could be avoided if the government would implement this proposal.The answer to which of the following questions would be most important in determining whether implementing the proposal would be likely to achieve the desired result?
3 Homeowners aged 40 to 50 are more likely to purchase ice cream and are more likely to purchase it in larger amounts than are members of any other demographic group. The popular belief that teenagers eat more ice cream than adults must, therefore, be false.The argument is flawed primarily because the author
4 According to a prediction of the not-so-distant future published in 1940, electricity would revolutionize agriculture. Electrodes would be inserted into the soil, and the current between them would kill bugs and weeds and make crop plants stronger.Which of the following, if true, most strongly indicates that the logic of the prediction above is flawed?
5 A company is considering changing its policy concerning daily working hours. Currently, this company requires all employees to arrive at work at 8 a.m. The proposed policy would permit each employee to decide when to arrive-from as early as 6 a.m. to as late as 11 a.m.The adoption of this policy would be most likely to decrease employees productivity if the employees job functions required them to
6 The amount of time it takes for most of a workers occupational knowledge and skills to become obsolete has been declining because of the introduction of advanced manufacturing technology (AMT). Given the rate at which AMT is currently being introduced in manufacturing, the average workers old skills become obsolete and new skills are required within as little as five years.Which of the following plans, if feasible, would allow a company to prepare most effectively for the rapid obsolescence of skills described above?
7 Travertons city council wants to minimize the citys average yearly expenditures on its traffic signal lights and so is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume significantly less energy and cost no more to purchase. Moreover, the costs associated with the conversion of existing fixtures so as to accept LED arrays would be minimal.Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Travertons yearly maintenance costs?
8 A report that many apples contain a cancer-causing preservative called Alar apparently had little effect on consumers. Few consumers planned to change their apple-buying habits as a result of the report. Nonetheless, sales of apples in grocery stores fell sharply in March, a month after the report was issued.Which of the following, if true, best explains the reason for the apparent discrepancy described above?
9 In order to reduce the number of items damaged while in transit to customers, packaging consultants recommended that the TrueSave mail-order company increase the amount of packing material so as to fill any empty spaces in its cartons. Accordingly, TrueSave officials instructed the companys packers to use more packing material than before, and the packers zealously acted on these instructions and used as much as they could. Nevertheless, customer reports of damaged items rose somewhat.Which of the following, if true, most helps to explain why acting on the consultants recommendation failed to achieve its goal?
10 Cable-television spokesperson: Subscriptions to cable television are a bargain in comparison to "free" television. Remember that "free" television is not really free. It is consumers, in the end, who pay for the costly advertising that supports "free" television.Which of the following, if true, is most damaging to the position of the cable-television spokesperson?
11 Wood smoke contains dangerous toxins that cause changes in human cells. Because wood smoke presents such a high health risk, legislation is needed to regulate the use of open-air fires and wood-burning stoves.Which of the following, if true, provides the most support for the argument above?
12 A certain automaker aims to increase its market share by deeply discounting its vehicles' prices for the next several months. The discounts will cut into profits, but because they will be heavily advertised the manufacturer hopes that they will attract buyers away from rival manufacturers' cars. In the longer term, the automaker envisions that customers initially attracted by the discounts may become loyal customers.In assessing the plan's chances of achieving its aim, it would be most useful to know which of the following?
13 In Swartkans territory, archaeologists discovered charred bone fragments dating back one million years. Analysis of the fragments, which came from a variety of animals, showed that they had been heated to temperatures no higher than those produced in experimental campfires made from branches of white stinkwood, the most common tree around Swartkans.Which of the following, if true, would, together with the information above, provide the best basis for the claim that the charred bone fragments are evidence of the use of fire by early hominids?
14 In Washington County, attendance at the movies is just large enough for the cinema operators to make modest profits. The size of the countys population is stable and is not expected to increase much. Yet there are investors ready to double the number of movie screens in the county within five years, and they are predicting solid profits both for themselves and for the established cinema operators.Which of the following, if true about Washington County, most helps to provide a justification for the investors prediction?
15 A conservation group in the United States is trying to change the long-standing image of bats as frightening creatures. The group contends that bats are feared and persecuted solely because they are shy animals that are active only at night.Which of the following, if true, would cast the most serious doubt on the accuracy of the groups contention?
16 Which of the following best completes the passage below?People buy prestige when they buy a premium product. They want to be associated with something special. Mass-marketing techniques and price-reduction strategies should not be used because_____.
17 Hunter: Many people blame hunters alone for the decline in Greenrock National Forest's deer population over the past ten years. Yet clearly, black bears have also played an important role in this decline. In the past ten years, the forests protected black bear population has risen sharply, and examination of black bears found dead in the forest during the deer hunting season showed that a number of them had recently fed on deer.In the hunters argument, the portion in boldface plays which of the following roles?
18 In Asia, where palm trees are nonnative, the trees flowers have traditionally been pollinated by hand, which has kept palm fruit productivity unnaturally low. When weevils known to be efficient pollinators of palm flowers were introduced into Asia in 1980, palm fruit productivity increased-by up to 50 percent in some areas-but then decreased sharply in 1984.Which of the following statements, if true, would best explain the 1984 decrease in productivity?
19 Physician: The hormone melatonin has shown promise as a medication for sleep disorders when taken in synthesized form. Because the long-term side effects of synthetic melatonin are unknown, however, I cannot recommend its use at this time. Patient: Your position is inconsistent with your usual practice. You prescribe many medications that you know have serious side effects, so concern about side effects cannot be the real reason you will not prescribe melatonin.The patients argument is flawed because it fails to consider that
20 In recent years, many cabinetmakers have been winning acclaim as artists. But since furniture must be useful, cabinetmakers must exercise their craft with an eye to the practical utility of their product. For this reason, cabinetmaking is not art.Which of the following is an assumption that supports drawing the conclusion above from the reason given for that conclusion?

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