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GWD
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Escalating worldwide demand for corn has led to a sharp increase in the market price of corn, and corn prices are likely to remain high. Corn is extensive used as feed for livestock, and because profit margins are tight in the livestock business, many farmers are expected to leave the business. With fewer suppliers, meat prices will surely rise. Nonetheless, observers expect an immediate short-term decrease in meat prices.Which of the following, if true, most helps to justify the observers' expectation?
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PREP07 Test 1
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Adult female rats who have never before encountered rat pups will start to show maternal behaviors after being confined with a pup for about seven days. This period can be considerably shortened by disabling the female's sense of smell or by removing the scent-producing glands of the pup.Which of the following hypotheses best explains the contrast described above?
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Which of the following best completes the passage below?In a survey of job applicants, two-fifths admitted to being at least a little dishonest.However, the survey may underestimate the proportion of job applicants who are dishonest, because ________.
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PREP2012
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Increases in the level of high-density lipoprotein (HDL)in the human bloodstream lower bloodstream cholesterol levels by increasing the body's capacity to rid itself of excess cholesterol. Levels of HDL in the bloodstream of some individuals are significantly increased by a program of regular exercise and weight reduction.Which of the following can be correctly inferred from the statements above?
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Extinction is a process that can depend on a variety of ecological, geographical, and physiological variables.These variables affect different species of organisms in different ways, and should, therefore, yield a random pattern of extinctions.However, the fossil record shows that extinction occurs in a surprisingly definite pattern, with many species vanishing at the same time.Which of the following, if true, forms the best basis for at least a partial explanation of the patterned extinctions revealed by the fossil record?
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PREP07 Test 1 OG18-语文分册
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Which of the following best completes the passage below?At a recent conference on environmental threats to the North Sea, most participating countries favored uniform controls on the quality of effluents, whether or not specific environmental damage could be attributed to a particular source of effluent. What must, of course, be shown, in order to avoid excessively restrictive controls, is that _______________ .
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PREP07 Test 2 OG18-语文分册 OG19-语文分册 OG20-语文分册
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The sustained massive use of pesticides in farming has two effects that are especially pernicious.First, it often kills off the pests' natural enemies in the area.Second, it often unintentionally gives rise to insecticide-resistant pests, since those insects that survive a particular insecticide will be the ones most resistant to it, and they are the ones left to breed.From the passage above, it can be properly inferred that the effectiveness of the sustained massive use of pesticides can be extended by doing which of the following, assuming that each is a realistic possibility?
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PREP07 Test 2
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Since the deregulation of airlines, delays at the nation's increasingly busy airports have increased by 25 percent.To combat this problem, more of the takeoff and landing slots at the busiest airports must be allocated to commercial airlines.Which of the following, if true, casts the most doubt on the effectiveness of the solution proposed above?
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PREP07 Test 2
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Start-up companies financed by venture capitalists have a much lower failure rate than companies financed by other means. Source of financing, therefore, must be a more important causative factor in the success of a start-up company than are such factors as the personal characteristics of the entrepreneur, the quality of strategic planning, or the management structure of the company.Which of the following, if true, most seriously weakens the argument above?
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PREP07 Test 2
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Half of the subjects in an experiment-the experimental group-consumed large quantities of a popular artificial sweetener.Afterward, this group showed lower cognitive abilities than did the other half of the subjects-the control group.who did not consume the sweetener.The detrimental effects were attributed to an amino acid that is one of the sweetener's principal constituents.Which of the following, if true, would best help explain how the sweetener might produce the observed effect?
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In the arid land along the Colorado River, use of the river's water supply is strictly controlled：farms along the river each have a limited allocation that they are allowed to use for irrigation.But the trees that grow in narrow strips along the river's banks also use its water.Clearly, therefore, if farmers were to remove those trees, more water would be available for crop irrigation.Which of the following, if true, most seriously weakens the argument?
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Editorial：The mayor plans to deactivate the city's fire alarm boxes, because most calls received from them are false alarms.The mayor claims that the alarm boxes are no longer necessary, since most people now have access to either public or private telephones.But the city's commercial district, where there is the greatest risk of fire, has few residents and few public telephones, so some alarm boxes are still necessary.Which of the following, if true, most seriously weakens the editorial's argument?
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PREP07 Test 1
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State spokesperson：Many businesspeople who have not been to our state believe that we have an inadequate road system.Those people are mistaken, as is obvious from the fact that in each of the past six years, our state has spent more money per mile on road improvements than any other state.Which of the following, if true, most seriously undermines the reasoning in the spokesperson's argument?
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If the airspace around centrally located airports were restricted to commercial airliners and only those private planes equipped with radar, most of the private-plane traffic would be forced to use outlying airfields. Such a reduction in the amount of private-plane traffic would reduce the risk of midair collision around the centrally located airports.Which of the following, if true, would most strengthen the conclusion drawn in the second sentence?
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Dental researchers recently discovered that tooth-brushes can become contaminated with bacteria that cause pneumonia and strep throat.They found that contamination usually Occurs after toothbrushes have been used for four weeks.For that reason, people should replace their toothbrushes at least once a month.Which of the following, if true, would most weaken the conclusion above?
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PREP07 Test 2
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Leaders of a miners' union on strike against Coalco are contemplating additional measures to pressure the company to accept the union's contract proposal. The union leaders are considering as their principal new tactic a consumer boycott against Gasco gas stations, which are owned by Energy Incorporated, the same corporation that owns Coalco.The answer to which of the following questions is LEAST directly relevant to the union leaders' consideration of whether attempting a boycott of Gasco will lead to acceptance of their contract proposal?
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PREP07 Test 2
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Transnational cooperation among corporations is experiencing a modest renaissance among United States firms.even though projects undertaken by two or more corporations under a collaborative agreement are less profitable than projects undertaken by a single corporation.The advantage of transnational cooperation is that such joint international projects may allow United States firms to win foreign contracts that they would not otherwise be able to win.Which of the following is information provided by the passage above?
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PREP07 Test 1 OG18-语文分册
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Crops can be traded on the futures market before they are harvested.If a poor corn harvest is predicted, prices of corn futures rise; if a bountiful corn harvest is predicted, prices of corn futures fall.This morning meteorologists are predicting much-needed rain for the corn-growing region starting tomorrow. Therefore, since adequate moisture is essential for the current crop's survival, prices of corn futures will fall sharply today.Which of the following, if true, most weakens the argument above?
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Gortland has long been narrowly self-sufficient in both grain and meat.However, as per capita income in Gortland has risen toward the world average, per capita consumption of meat has also risen toward the world average, and it takes several pounds of grain to produce one pound of meat. Therefore, since per capita income continues to rise, whereas domestic grain production will not increase, Gortland will soon have to import either grain or meat or both.Which of the following is an assumption on which the argument depends?
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Meteorite explosions in the Earth's atmosphere as large as the one that destroyed forests in Siberia, with approximately the force of a 12-megaton nuclear blast, occur about once a century.The response of highly automated systems controlled by complex computer programs to unexpected circumstances is unpredictable.Which of the following conclusions can most properly be drawn, if the statements above are true, about a highly automated nuclear-missile defense system controlled by a complex computer program?
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