2013年GMAT逻辑推理模拟训练（19）

　　30 Minutes 20 Questions

　　1. The country of Maravia has severe air pollution, 80 percent of which is caused by the exhaust fumes of cars. In order to reduce the number of cars on the road, the government is raising taxes on the cost of buying and running a car by 20 percent. This tax increase, therefore, will significantly reduce air pollution in Maravia.

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

　　(A) The government of Maravia is in the process of building a significant number of roadways.

　　(B) Maravia is an oil-producing country and is able to refine an amount of gasoline sufficient for the needs of its population.

　　(C) Maravia has had an excellent public transportation system for many years.

　　(D) Ninety percent of the population of Maravia is very prosperous and has a substantial amount of disposable income.(D)

　　(E) In Maravia, cars that emit relatively low levels of pollutants cost 10 percent less to operate, on average, than do cars that emit high levels of pollutants.

　　2. Consumer income reports produced by the government distinguish between households and families by means of the following definition: “A family is a household containing a householder and at least one person related to the householder.” Except for the homeless and people in group living quarters, most people live in households.

　　According to the definition above, which of the following must be true?

　　(A) All householders are members of families.

　　(B) All families include a householder.

　　(C) All of the people related to a householder form a family.

　　(D) Some people residing in group living quarters are members of families.(B)

　　(E) Some homeless people reside in group living quarters.

　　Questions 3-4 are based on the following.

　　The proportion of manufacturing companies in Alameda that use microelectronics in their manufacturing processes increased from 6 percent in 1979 to 66 percent in 1990. Many labor leaders say that the introduction of microelectronics is the principal cause of the great increase in unemployment during that period in Alameda. In actual fact, however, most of the job losses were due to organizational changes. Moreover, according to new figures released by the labor department, there were many more people employed in Alameda in the manufacturing industry in 1990 than in 1979.

　　3. Which of the following, if true, best reconciles the discrepancy between the increase in unemployment and the increase in jobs in the manufacturing industry of Alameda?

　　(A) Many products that contain microelectronic components are now assembled completely by machine.

　　(B) Workers involved in the various aspects of the manufacturing processes that use microelectronic technology need extensive training.

　　(C) It is difficult to evaluate numerically what impact on job security the introduction of microelectronics in the workplace had before 1979.

　　(D) In 1990 over 90 percent of the jobs in Alameda’s manufacturing companies were filled by workers who moved to Alameda because they had skills for which there was no demand in Alameda prior to the introduction of microelectronics there.(D)

　　(E) Many workers who have retired from the manufacturing industry in Alameda since 1979 have not been replaced by younger workers.

　　4. Which of the following, if true, would most strengthen the labor leaders’ claim concerning the manufacturing industry in Alameda?

　　(A) From 1979 to 1990, fewer employees of manufacturing companies in Alameda lost their jobs because of the introduction of microelectronics than did employees of manufacturing companies in the nearby community of Rockside.

　　(B) The figures on the use of microelectronics that were made public are the result of inquiries made of managers in the manufacturing industry in Alameda.

　　(C) The organizational changes that led to job losses in all sectors of the manufacturing industry in Alameda were primarily the result of the introduction of microelectronics.

　　(D) Figures on job losses in the manufacturing industry in Alameda for the late sixties and early seventies have not been made available.(C)

　　(E) A few jobs in the manufacturing industry in Alameda could have been saved if workers had been willing to become knowledgeable in microelectronics.

　　5. The number of musicians employed to play accompaniment for radio and television commercials has sharply decreased over the past ten years. This has occurred even though the number of commercials produced each year has not significantly changed for the last ten years.

　　Which of the following, if it occurred during the past ten years, would contribute LEAST to an explanation of the facts above?

　　(A) The type of music most popular for use in commercials has changed from a type that requires a large number of instruments to a type that requires very few instruments.

　　(B) There has been an increase in the number of commercials that use only the spoken word and sound effects, rather than musical accompaniment.

　　(C) There has been an increase in the number of commercials that use a synthesizer, an instrument on which one musician can reproduce the sound of many musicians playing together.

　　(D) There has been an increase in the number of commercials that use prerecorded music as their only source of music.(E)

　　(E) There has been an increase in the number of commercials that use musicians just starting in the music industry rather than musicians experienced in accompanying commercials.

　　6. Recent audits revealed that BanqueCard, a credit service, has erred in calculating the interest it charges its clients. But BanqueCard’s chief accountant reasoned that the profits that the company shows would remain unaffected by a revision of its clients’ credit statements to correct its previous billing errors, since just as many clients had been overcharged as undercharged.

　　Which of the following is a reasoning error that the accountant makes in concluding that correcting its clients’ statements would leave BanqueCard’s profits unaffected?

　　(A) Relying on the reputation of BanqueCard as a trustworthy credit service to maintain the company’s clientele after the error becomes widely known

　　(B) Failing to establish that BanqueCard charges the same rates of interest for all of its clients

　　(C) Overlooking the possibility that the amount by which BanqueCard’s clients had been overcharged might be greater than the amount by which they had been undercharged

　　(D) Assuming that the clients who had been overcharged by BanqueCard had not noticed the error in their credit bills(C)

　　(E) Presupposing that each one of BanqueCard’s clients had either been overcharged or else had been undercharged by the billing error

　　7. Not Scored

　　8. Residents of an apartment complex are considering two possible plans for collecting recyclable trash.

　　Plan 1 - Residents will deposit recyclable trash in municipal dumpsters located in the parking lot. The trash will be collected on the first and the fifteenth days of each month.

　　Plan 2 - Residents will be given individual containers for recyclable trash. The containers will be placed at the curb twice a week for trash collection.

　　Which of the following points raised at a meeting of the residents, if valid, would most favor one of the recycling plans over the other?

　　(A) Residents will be required to exercise care in separating recyclable trash from nonrecyclable trash.

　　(B) For trash recycling to be successful, residents must separate recyclable bottles and cans from recyclable paper products.

　　(C) Penalties will be levied against residents who fail to sort their trash correctly.

　　(D) Individual recycling containers will need to be made of a strong and durable material.(E)

　　(E) Recyclable trash that is allowed to accumulate for two weeks will attract rodents.

　　9. In 1990 all of the people who applied for a job at Evco also applied for a job at Radeco, and Evco and Radeco each offered jobs to half of these applicants. Therefore, every one of these applicants must have been offered a job in 1990.

　　The argument above is based on which of the following assumptions about these job applicants?

　　(A) All of the applicants were very well qualified for a job at either Evco or Radeco.

　　(B) All of the applicants accepted a job at either Evco or Radeco.

　　(C) None of the applicants was offered a job by both Evco and Radeco.

　　(D) None of the applicants had applied for jobs at places other than Evco and Radeco.(C)

　　(E) None of the applicants had previously worked for either Evco or Radeco.

　　10. The geese that gather at the pond of a large corporation create a hazard for executives who use the corporate helicopter, whose landing site is 40 feet away from the pond. To solve the problem, the corporation plans to import a large number of herding dogs to keep the geese away from the helicopter.

　　Which of the following, if a realistic possibility, would cast the most serious doubt on the prospects for success of the corporation’s plan?

　　(A) The dogs will form an uncontrollable pack.

　　(B) The dogs will require training to learn to herd the geese.

　　(C) The dogs will frighten away foxes that prey on old and sick geese.

　　(D) It will be necessary to keep the dogs in quarantine for 30 days after importing them.(A)

　　(E) Some of the geese will move to the pond of another corporation in order to avoid being herded by the dogs.