削弱题-CR-OG:第41-50题 练习册详情

1

Northern Air has dozens of flights daily into and out of Belleville Airport, which is highly congested. NorthernAir depends for its success on economy and quick turnaround and consequently is planning to replace its largeplanes with Skybuses, whose novel aerodynamic design is extremely fuel efficient. The Skybus' fuel efficiency results in both lower fuel costs and reduced time spent refueling.

Which of the following, if true, could present the most serious disadvantage for Northern Air in replacing their large planes with Skybuses?

• The Skybus would enable Northern Air to schedule direct flights to destinations that currently require stopsfor refueling.
• Aviation fuel is projected to decline in price over the next several years.
• The fuel efficiency of the Skybus would enable Northern Air to eliminate refueling at some of its destinations, but several mechanics would lose their jobs.
• None of Northern Air's competitors that use Belleville Airport are considering buying Skybuses.
• The aerodynamic design of the Skybus causes turbulence behind it when taking off that forces other planes on the runway to delay their takeoffs.

9979人做过此题 平均耗时为11min15s 平均正确率为 70%

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2

Firms adopting "profit-related-pay" (PRP) contracts pay wages at levels that vary with the firm's profits. In the metalworking industry last year, firms with PRP contracts in place showed productivity per worker on average 13 percent higher than that of their competitors who used more traditional contracts.

If, on the basis of the evidence above, it is argued that PRP contracts increase worker productivity, which of the following, if true, would most seriously weaken that argument?

• Results similar to those cited for the metal-working industry have been found in other industries where PRP contracts are used.
• Under PRP contracts costs other than labor costs, such as plant, machinery, and energy, make up an increased proportion of the total cost of each unit of output.
• Because introducing PRP contracts greatly changes individual workers' relationships to the firm, negotiating the introduction of PRP contracts in complex and time consuming.
• Many firms in the metalworking industry have modernized production equipment in the last five years, and most of these introduced PRP contracts at the same time.
• In firms in the metalworking industry where PRP contracts are in place, the average take-home pay is 15 percent higher than it is in those firms where workers have more traditional contracts.

4595人做过此题 平均耗时为1min50s 平均正确率为 56%

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3

Although the discount stores in Goreville's central shopping district are expected to close within five years as a result of competition from a SpendLess discount department store that just opened, those locations will not stay vacant for long. In the five years since the opening of Colson's, a nondiscount department store, a new store has opened at the location of every store in the shopping district that closed because it could not compete with Colson's.

Which of the following, if true, most seriously weakens the argument?

• Many customers of Colson's are expected to do less shopping there than they did before the SpendLess store opened.
• Increasingly, the stores that have opened in the central shopping district since Colson's opened have been discount stores.
• At present, the central shopping district has as many stores operating in it as it ever had.
• Over the course of the next five years, it is expected that Goreville's population will grow at a faster rate than it has for the past several decades.
• Many stores in the central shopping district sell types of merchandise that are not available at either SpendLess or Colson's.

10000人做过此题 平均耗时为7min7s 平均正确率为 56%

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4

Rye sown in the fall and plowed into the soil in early spring leaves a residue that is highly effective at controlling broad-leaved weeds, but unfortunately for only about 45 days. No major agricultural crop matures from seed in as little as 45 days. Synthetic herbicides, on the other hand, although not any longer-lasting, can be reapplied as the crop grows. Clearly, therefore, for major agricultural crops, plowing rye into the soil can play no part in effective weed control.

The argument is most vulnerable to the objection that it fails to

• consider that there might be minor, quick-growing crops that do mature in 45 days or less
• identify any alternative method of weed control that could be used instead of the method it rejects
• distinguish among the various kinds of synthetic herbicides
• allow for the possibility of combining the two weed-control methods it mentions
• allow for the possibility that plants other than rye, handled the same way, might have the same effect

10000人做过此题 平均耗时为3min52s 平均正确率为 76%

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5

An eyeglass manufacturer tried to boost sales for the summer quarter by offering its distributors a special discount if their orders for that quarter exceeded those for last year's summer quarter by at least 20 percent.Many distributors qualified for this discount.Even with much merchandise discounted, sales increased enough to produce a healthy gain in net profits.The manufacturer plans to repeat this success by offering the same sort of discount for the fall quarter.

Which of the following, if true, most clearly points to a flaw in the manufacturer's plan to repeat the successful performance of the summer quarter?

• In general, a distributor's orders for the summer quarter are no higher than those for the spring quarter.
• Along with offering special discounts to qualifying distributors, the manufacturer increased newspaper and radio advertising in those distributors' sales areas.
• The distributors most likely to qualify for the manufacturer's special discount are those whose orders were unusually low a year earlier.
• The distributors who qualified for the manufacturer's special discount were free to decide how much of that discount to pass on to their own customers.
• The distributors' ordering more goods in the summer quarter left them overstocked for the fall quarter.

1350人做过此题 平均耗时为5min29s 平均正确率为 82%

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6

Hotco oil burners, designed to be used in asphalt plants, are so efficient that Hotco will sell one to the Clifton Asphalt plant for no payment other than the cost savings between the total amount the asphalt plant actually paid for oil using its former burner during the last two years and the total amount it will pay for oil using the Hotco burner during the next two years. On installation, the plant will make an estimated payment, which will be adjusted after two years to equal the actual cost savings.

Which of the following, if it occurred, would constitute a disadvantage for Hotco of the plan described above?

• Another manufacturer's introduction to the market of a similarly efficient burner
• The Clifton Asphalt plant's need for more than one new burner
• Very poor efficiency in the Clifton Asphalt plant's old burner
• A decrease in the demand for asphalt
• A steady increase in the price of oil beginning soon after the new burner is installed

6432人做过此题 平均耗时为5min23s 平均正确率为 68%

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7

Last year the rate of inflation was 1.2 percent, but during the current year it has been 4 percent. We can conclude that inflation is on an upward trend and the rate will be still higher next year.

Which of the following, if true, most seriously weakens the conclusion above?

• The inflation figures were computed on the basis of a representative sample of economic data rather than all the available data.
• Last year a dip in oil prices brought inflation temporarily below its recent stable annual level of 4 percent.
• Increases in the pay of some workers are tied to the level of inflation, and at an inflation rate of 4 percent or above, these pay raises constitute a force causing further inflation.
• The 1.2 percent rate of inflation last year represented a 10-year low.
• Government intervention cannot affect the rate of inflation to any significant degree.

9944人做过此题 平均耗时为8min50s 平均正确率为 54%

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8

Outsourcing is the practice of obtaining from an independent supplier a product or service that a company has previously provided for itself. Since a company's chief objective is to realize the highest possible year-end profits, any product or service that can be obtained from an independent supplier for less than it would cost the company to provide the product or service on its own should be outsourced.

Which of the following, if true, most seriously weakens the argument?

• If a company decides to use independent suppliers for a product, it can generally exploit the vigorous competition arising among several firms that are interested in supplying that product.
• Successful outsourcing requires a company to provide its suppliers with information about its products and plans that can fall into the hands of its competitors and give them a business advantage.
• Certain tasks, such as processing a company's payroll, are commonly outsourced, whereas others, such as handling the company's core business, are not.
• For a company to provide a product or service for itself as efficiently as an independent supplier can provide it, the managers involved need to be as expert in the area of that product or service as the people in charge of that product or service at an independent supplier are.
• When a company decides to use an independent supplier for a product or service, the independent supplier sometimes hires members of the company's staff who formerly made the product or provided the service that the independent supplier now supplies.

5452人做过此题 平均耗时为2min40s 平均正确率为 70%

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9

The earliest Mayan pottery found at Colha, in Belize, is about 3,000 years old. Recently, however, 4,500-year-old stone agricultural implements were unearthed at Colha. These implements resemble Mayan stone implements of a much later period, also found at Colha. Moreover, the implements' designs are strikingly different from the designs of stone implements produced by other cultures known to have inhabited the area in prehistoric times. Therefore, there were surely Mayan settlements in Colha 4,500 years ago.

Which of the following, if true, most seriously weakens the argument?

• Ceramic ware is not known to have been used by the Mayan people to make agricultural implements.
• Carbon-dating of corn pollen in Colha indicates that agriculture began there around 4,500 years ago.
• Archaeological evidence indicates that some of the oldest stone implements found at Colha were used to cut away vegetation after controlled burning of trees to open areas of swampland for cultivation.
• Successor cultures at a given site often adopt the style of agricultural implements used by earlier inhabitants of the same site.
• Many religious and social institutions of the Mayan people who inhabited Colha 3,000 years ago relied on a highly developed system of agricultural symbols.

6240人做过此题 平均耗时为3min16s 平均正确率为 71%

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10

Caterpillars of all species produce an identical hormone called "juvenile hormone" that maintains feeding behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding.

Which of the following, if true, most strongly supports the view that it would NOT be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above?

• Most species of caterpillar are subject to some natural predation.
• Many agricultural pests do not go through a caterpillar stage.
• Many agriculturally beneficial insects go through a caterpillar stage.
• Since caterpillars of different species emerge at different times, several sprayings would be necessary.
• Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as yet.

1097人做过此题 平均耗时为5min41s 平均正确率为 58%

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