A.Many manufacturing industries in the United States have lost a significant share of their domestic and foreign markets to foreign producers.
B.Services accounted for half of all jobs in the late 1940"s but today account for seventy percent of all jobs.
C.Manufacturing output was one-third higher in 1980 than in 1970, while manufacturing employment grew only five percent during that period.
D.Manufacturing industries, on average, pay a higher per-hour wage and use fewer part-time employees than do service industries.
E.Living standards in states that have shifted to manufacturing economies within the last fifty years are closer to the national average now than in 1940.
第1题
ing antibiotic environments, the presence of resistant bacteria in people could be due to the human use of prescription antibiotics. Some scientists, however, believe that most resistant bacteria in people derive from human consumption of bacterially infected meat. Which of the following statements, if true, would most significantly strengthen the hypothesis of the scientists?
A.Antibiotics are routinely included in livestock feed so that livestock producers can increase the rate of growth of their animals.
B.Most people who develop food poisoning from bacterially infected meat are treated with prescription antibiotics.
C.The incidence of resistant bacteria in people has tended to be much higher in urban areas than in rural areas where meat is of comparable quality.
D.People who have never taken prescription antibiotics are those least likely to develop resistant bacteria.
E.Livestock producers claim that resistant bacteria in animals cannot be transmitted to people through infected meat.
第2题
ve Pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results. Which of the following, if true, gives the most support to the recommendation above?
A.The accepted treatment for Pironoma does not have damaging side effects.
B.The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect Pironoma.
C.In treating Pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.
D.The proportion of inconclusive test results is equal for all laboratory tests used to detect Pironoma.
E.All laboratory tests to detect Pironoma have the same proportion of false negative results.
第3题
rs adversely affecting people in the past decade than in previous decades. We can conclude that the planet Earth as a natural environment has become more inhospitable and dangerous, and we should employ the weather and earth sciences to look for causes of this trend. The conclusion drawn above is most seriously weakened if which of the following is true?
A.The weather and earth sciences have provided better early warning systems for natural disasters in the past decade than in previous decades.
B.International relief efforts for victims of natural disasters have been better organized in the past decade than in previous decades.
C.There are records of major earthquakes, volcanic eruptions, droughts, landslides, and floods occurring in the distant past, as well as in the recent past.
D.Population pressures and poverty have forced increasing numbers of people to live in areas prone to natural disasters.
E.There have been no changes in the past decade in people"s land-use practices that could have affected the climate.
第4题
ave cut their employee ranks by more than 3,000 persons. Thus, although deregulated competition has afforded consumers dramatically lower fares, the economy of the United States has been harmed by deregulation of the airlines. The argument above would be most seriously weakened if it were true that
A.a poll of people in the United States expressed exceptionally strong support for airline deregulation.
B.fewer passengers now travel on commercial airlines than traveled on them in 1978, with the consequence that fewer employees are needed to operate the airlines than were needed in 1978.
C.airlines now fly a more restricted regular schedule of routes than they did in 1978, with the consequence that the industry is more highly concentrated and competitive than it was before 1978.
D.several major airlines now enjoy significantly higher profits and levels of employment than they did in the years preceding the Deregulation Act.
E.smaller carriers of passengers have thrived as a result of deregulation and now provide more new jobs than the major airlines have eliminated since 1978.
第5题
ere are who advertise their services , and the lawyers who advertise a specific service usually charge less for that service than lawyers who do not advertise. Therefore, if the state removes any of its current restrictions, such as the one against advertisements that do not specify fee arrangements, overall consumer legal costs will be lower than if the state retains its current restrictions. Which of the following, if true, would most seriously weaken the argument concerning overall consumer legal costs?
A.The state has recently removed some other restrictions that had limited the advertising of legal services.
B.The state is unlikely to remove all of the restrictions that apply solely to the advertising of legal services.
C.Lawyers who do not advertise generally provide legal ser-vices of the same quality as those provided by lawyers who do advertise.
D.Most lawyers who now specify fee arrangements in their advertisements would continue to do so even if the specification were not required.
E.Most lawyers who advertise specific services do not lower their fees for those services when they begin to advertise.
第6题
ats 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?
A.Hals are steadily losing natural roosting places such as caves and hollow trees and are thus turning to more developed areas for roosting.
B.Hats are the chief consumers of nocturnal insects and thus can help make their hunting territory more pleasant for humans.
C.Hats are regarded as frightening creatures not only in the United States but also in Europe, Africa, and South America.
D.Raccoons and owls are shy and active only at night; yet they are not generally feared and persecuted.
E.People know more about the behavior. of other greatly feared animal species, such as lions, alligators, and snakes, than they do about the behavior. of bats.
第7题
idents are toxic to humans and often explode soon after being released. In order to prevent passenger deaths from gas inhalation, safety officials recommend that passengers be provided with smoke hoods that prevent inhalation of the gases. Which of the following, if true, constitutes the strongest reason not to require implementation of the safety officials recommendation?
A.Test evacuations showed that putting on the smoke hoods ridded considerably to the overall time it took passengers to leave the cabin.
B.Some airlines are unwilling to buy the smoke hoods because they consider them to be prohibitively expensive.
C.Although the smoke hoods protect passengers from the toxic gases, they can do nothing to prevent the gases from igniting.
D.Some experienced flyers fail to pay attention to the safety instructions given on every commercial flight before takeoff.
E.In many airplane accidents, passengers who were able to reach emergency exits were overcome by toxic gases before they could exit the airplane.
第8题
lion 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?
A.The white stinkwood tree is used for building material by the present-day inhabitants of Swartkans.
B.Forest fires can heat wood to a range of temperatures that occur in campfires.
C.The bone fragments were fitted together by the archaeologists to form. the complete skeletons of several animals.
D.Apart from the Swartkans discovery, there is reliable evidence that early hominids used fire as many as 500 thousand years ago.
E.The bone fragments were found in several distinct layers of limestone that contained primitive cutting tools known to have been used by early hominids.
第9题
?
A.It did not receive approval until Canizares" work was published.
B.It was not widely accepted in the 1970"s.
C.It did not receive support initially because technology was not available to confirm its tenets.
D.It supports earlier speculation that intergalactic gas was largely the result of explosions outside the galaxy.
E.It was widely challenged until x-ray evidence of gas temperatures in NGC 1275 had been presented.
第10题
of the following characteristics?
A.It is one-tenth hotter than it was in the outer regions of the galaxy cluster.
B.It emits radiation with wavelengths that change as the gas moves toward the center of the galaxy.
C.The total amount of radiation emitted diminishes as the gas cools.
D.It loses 90 percent of its energy as it moves to the center of the galaxy.
E.It condenses at a rate much slower than the rate of decrease in temperature as the gas flows inward.
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