归纳题-CR-PREP:第1-10题 练习册详情

1

Electric utilities pay less for low-quality coal per ton delivered than for high-quality coal. Yet more low-quality coal than hogn-quality coal must be burned to generate the same amout of electricity. Moreover, per ton of coal burned, low-quality coal generates more ash than does high-quality coal, and the disposal of ash is becoming more and more expensive.

The considerations above, if true, most strongly support which of the following chaims?

• A coal-burning utility migth not be assured of benefiting economically by always adhering to the policy of keeping its overall coal purchasing costs as low sa possible.
• In those regions where the cost of disposing of coal ash is negligible, it is more expensive for coal-burning utilities to use high-quality coal than low-quality coal.
• Transportation costs repersent a smaller proportion fo the cost per delivered ton for low-quality coal than for high-quality coal.
• It is no less expensive to dispose of a ton of coal ash that results from the burning of high-quality coal than it is to dispose of a ton of coal ash that results from the burning of low-quality coal.
• In regions where coal-ash disposal is the least expensive, reserves of low-quality coal are likely to decline at a faster rate than are reserves of high-quality coal.

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2

When a city experiences a sharp decline in population, the city's tax revenues, which pay for such city services as police protection and maintenance of water lines, also decrease. The area to be policed and the number and length of the water lines to be maintained, however, do not decrease. Attempting to make up the tax revenue lost by raising tax rates is not feasible, since higher tax rates would cause even more residents to leave.

The information given most strongly supports which of the following general claims?

• If, in a city with sharply declining population, police protection and water line maintenance do not deteriorate, some other service previously provided by the city will deteriorate or be eliminated.
• If a city's tax rates are held stable over a period of time, neither the population nor the levels of city services provided will tend to decline over that period.
• If a city's population declines sharply, police protection and water line maintenance are the services that deteriorate most immediately and most markedly.
• A city that suffers revenue losses because of a sharp decline in population can make up some of the lost tax revenue by raising tax rates, provided the city's tax rates are low in relation to those of other cities.
• A city that is losing residents because tax rates are perceived as too high by those residents can reverse this population trend by bringing its tax rates down to a more moderate level.

940人做过此题 平均耗时为5min53s 平均正确率为 53%

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3

Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.

Which of the following conclusions can properly be drawn from the information above?

• The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behavior
• Host insects lack any effective defenses against the form of predation practiced by parasitic wasps
• Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species
• Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs
• Parasitic wasps use visual clues to calculate the size of a host egg

9959人做过此题 平均耗时为12min49s 平均正确率为 40%

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4

The percentage of households with an annual income of more than $40,000 is higher in Merton County than in any other county. However, the percentage of households with an annual income of $60,000 or more is higher in Sommer County.

If the statements above are true, which of the following must also be true?

• The percentage of households with an annual income of $80,000 is higher in Sommer County than in Merton County.
• Merton County has the second highest percentage of households with an annual income of $60,000 or more.
• Some households in Merton County have an annual income between $40,000 and $60,000.
• The number of households with an annual income of more than $40,000 is greater in Merton County than in Sommer County.
• Average annual household income is higher in Sommer County than in Merton County.

10000人做过此题 平均耗时为3min45s 平均正确率为 71%

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5

When a caterpillar emerges from the egg on a tree branch, it immediately climbs upward until it finds a leaf bud to eat. Biologists thought that this behavior displayed an innate tendency to move in the direction opposite to the pull of gravity. In a recent experiment, a strong light source was placed at the bottom of a tree, and caterpillars, after hatching, climbed downward.

Which of the following hypotheses is best supported by the statements given?

• Caterpillars have an innate tendency to move in the direction of gravity.
• Newly hatched caterpillars are unable to see in the dark.
• Newly hatched caterpillars move towards the strongest light source in the environment.
• Newly hatched caterpillars move toward the leaf bud nearest to them.
• The eyes of newly hatched caterpillars become less sensitive to light over time.

9967人做过此题 平均耗时为7min5s 平均正确率为 42%

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6

First-time computer buyers buying PXC home computers typically buy models that cost much less and have a smaller profit margin per computer than do PXC computers bought by people replacing their computers with more powerful models. Last year PXC's profits from computer sales were substantially higher than the previous year, although about the same number of PXC computers were sold and the prices and profit margins for each computer model that PXC sells remained unchanged.

If the statements above are true, which of the following is most strongly supported by them?

• PXC's competitors raised the prices on their computers last year, making PXC computers more attractive to first-time computer buyers.
• The number of people buying PXC computers who also bought PXC computer-related products, such as printers, was larger last year than the previous year.
• Among computer buyers who bought a PXC computer to replace their existing computer, the proportion who were replacing a computer made by a competitor of PXC was greater last year than the previous year.
• The proportion of PXC computers bought by first-time computer buyers was smaller last year than the previous year.
• PXC's production costs for its computers were lower last year than they had been the previous year.

9954人做过此题 平均耗时为10min17s 平均正确率为 59%

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7

Junior biomedical researchers have long assumed that their hirings and promotions depend significantly on the amount of their published work. People responsible for making hiring and promotion decisions in the biomedical research field, however, are influenced much more by the overall impact that a candidate's scientific publications have on his or her field than by the number of those publications.

The information above, if accurate, argues most strongly against which of the following claims?

• Even biomedical researchers who are just beginning their careers are expected already to have published articles of major significance to the field.
• Contributions to the field of biomedical research are generally considered to be significant only if the work is published.
• The potential scientific importance of not-yet-published work is sometimes taken into account in decisions regarding the hiring or promotion of biomedical researchers.
• People responsible for hiring or promoting biomedical researchers can reasonably be expected to make a fair assessment of the overall impact of a candidate's publications on his or her field.
• Biomedical researchers can substantially increase their chances of promotion by fragmenting their research findings so that they are published in several journals instead of one.

242人做过此题 平均耗时为5min21s 平均正确率为 95%

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8

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on Friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

• All of Comcorp's shipments of building supplies last week were specially ordered.
• None of Comcorp's shipments sent on Friday of last week was sent to Truax Construction.
• None of the shipments sent by Comcorp to Truax Construction last week was specially ordered.
• None of Comcorp's shipments sent on Thursday of last week was sent to Truax Construction.
• All of Comcorp's shipments of building supplies last week were sent out on Thursday.

320人做过此题 平均耗时为5min49s 平均正确率为 84%

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9

Roland: The alarming fact is that 90 percent of the people in this country now report that they know someone who is unemployed.

Sharon: But a normal, moderate level of unemployment is 5 percent, with 1 out of 20 workers unemployed. So at any given time if a person knows approximately 50 workers, one or more will very likely be unemployed.

Sharon's argument is structured to lead to which of the following as a conclusion?

• The fact that 90% of the people know someone who is unemployed is not an indication that unemployment is abnormally high.
• The current level of unemployment is not moderate.
• If at least 5% of workers are unemployed, the result of questioning a representative group of people cannot be the percentage Roland cites.
• It is unlikely that the people whose statements Roland cites are giving accurate reports.
• If an unemployment figure is given as a certain percent, the actual percentage of those without jobs is even higher.

9967人做过此题 平均耗时为6min59s 平均正确率为 69%

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10

To protect certain fledgling industries, the government of country Z banned imports of the types of products those industries were starting to make. As a direct result, the cost of those products to the buyers, several export-dependent industries in Z, went up, sharply limiting the ability of those industries to compete effectively in their export markets.

Which of the following can be most properly inferred from the passage about the products whose importation was banned?

• Those products had been cheaper to import than they were to make within country Z's fledgling industries.
• Those products were the ones that country Z was hoping to export in its turn, once the fledgling industries matured.
• Those products used to be imported from just those countries to which country Z's exports went.
• Those products had become more and more expensive to import, which resulted in a foreign trade deficit just before the ban.
• Those products used to be imported in very small quantities, but they were essential to country Z's economy.

7340人做过此题 平均耗时为5min56s 平均正确率为 53%

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