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2007年GMAT考试最新逻辑推理仿真试题训练九(1)

2007-11-02 16:05

  1.After the national speed limit of 55 miles per hour was imposed in 1974, the number of deaths per mile driven on a highway fell abruptly as a result. Since then, however, the average speed of vehicles on highways has risen, but the number of deaths per mile driven on a highway has continued to fall. Which of the following conclusions can be properly drawn from the statements above?

 。ˋ) The speed limit alone is probably not responsible for the continued reduction in highway deaths in the years after 1974.
 。˙) People have been driving less since 1974.
 。–) Driver-education courses have been more effective since 1974 in teaching drivers to drive safely.
 。―) In recent years highway patrols have been less effective in catching drivers who speed.
 。‥) The change in the speed limit cannot be responsible for the abrupt decline in highway deaths in 1974.

  2.Neighboring landholders: Air pollution from the giant aluminum refinery that has been built next to our land is killing our plants.Company spokesperson: The refinery is not to blame, since our study shows that the damage is due to insects and fungi.Which of the following, if true, most seriously weakens the conclusion drawn by the company spokesperson?

 。ˋ) The study did not measure the quantity of pollutants emitted into the surrounding air by the aluminum refinery.
 。˙) The neighboring landholders have made no change in the way they take care of their plants.
 。–) Air pollution from the refinery has changed the chemical balance in the plants' environment, allowing the harmful insects and fungi to thrive.
 。―) Pollutants that are invisible and odorless are emitted into the surrounding air by the refinery.
 。‥) The various species of insects and fungi mentioned in the study have been occasionally found in the locality during the past hundred years.

  3.Sales taxes tend to be regressive, affecting poor people more severely than wealthy people. When all purchases of consumer goods are taxed at a fixed percentage of the purchase price, poor people pay a larger proportion of their income in sales taxes than wealthy people do.It can be correctly inferred on the basis of the statements above that which of the following is true?

 。ˋ) Poor people constitute a larger proportion of the taxpaying population than wealthy people do.
 。˙) Poor people spend a larger proportion of their income on purchases of consumer goods than wealthy people do.
 。–) Wealthy people pay, on average, a larger amount of sales taxes than poor people do.
 。―) The total amount spent by all poor people on purchases of consumer goods exceeds the total amount spent by all wealthy people on consumer goods.
 。‥) The average purchase price of consumer goods bought by wealthy people is higher than that of consumer goods bought by poor people.

  4.Reviewing historical data, medical researchers in California found that counties with the largest number of television sets per capita have had the lowest incidence of a serious brain disease, mosquito-borne encephalitis. The researchers have concluded that people in these counties stay indoors more and thus avoid exposure to the disease.The researchers' conclusion would be most strengthened if which of the following were true?

 。ˋ) Programs designed to control the size of disease-bearing mosquito populations have not affected the incidence of mosquito borne encephalitis.
 。˙) The occupations of county residents affect their risk of exposure to mosquito-borne encephalitis more than does television-watching.
 。–) The incidence of mosquito-borne encephalitis in counties with the largest number of television sets per capita is likely to decrease even further.
 。―) The more time people in a county spend outdoors, the greater their awareness of the dangers of mosquito-borne encephalitis.
 。‥) The more television sets there are per capita in a county, the more time the average county resident spends watching television.

  5.The city's public transportation system should be removed from the jurisdiction of the municipal government, which finds it politically impossible either to raise fares or to institute cost-saving reductions in service. If public transportation were handled by a private firm, profits would be vigorously pursued, thereby eliminating the necessity for covering operating costs with government funds.The statements above best support the conclusion that

 。ˋ) the private firms that would handle public transportation would have experience in the transportation industry
 。˙) political considerations would not prevent private firms from ensuring that revenues cover operating costs
 。–) private firms would receive government funding if it were needed to cover operating costs
 。―) the public would approve the cost-cutting actions taken by the private firm
 。‥) the municipal government would not be resigned to accumulating merely enough income to cover costs

  6.To entice customers away from competitors, Red Label supermarkets have begun offering discounts on home appliances to customers who spend $50 or more on any shopping trip to Red Label. Red Label executives claim that the discount program has been a huge success, since cash register receipts of $50 or more are up thirty percent since the beginning of the program.Which of the following, if true, most seriously weakens the claim of the Red Label executives?

 。ˋ) Most people who switched to Red Label after the program began spend more than $50 each time they shop at Red Label.
 。˙) Most people whose average grocery bill is less than $50 would not be persuaded to spend more by any discount program.
 。–) Most people who received discounts on home appliances through Red Label's program will shop at Red Label after the program ends.
 。―) Since the beginning of the discount program, most of the people who spend $50 or more at Red Label are people who have never before shopped there and whose average grocery bill has always been higher than $50.
 。‥) Almost all of the people who have begun spending $50 or more at Red Label since the discount program began are longtime customers who have increased the average amount of their shopping bills by making fewer trips.

  7.Throughout the 1950's, there were increases in the numbers of dead birds found in agricultural areas after pesticide sprayings. Pesticide manufacturers claimed that the publicity given to bird deaths stimulated volunteers to look for dead birds, and that the increase in numbers reported was attributable to the increase in the number of people looking.Which of the following statements, if true, would help to refute the claim of the pesticide manufacturers?

 。ˋ) The publicity given to bird deaths was largely regional and never reached national proportions.
 。˙) Pesticide sprayings were timed to coincide with various phases of the life cycles of the insects they destroyed.
 。–) No provision was made to ensure that a dead bird would not be reported by more than one observer.
 。―) Initial increases in bird deaths had been noticed by agricultural workers long before any publicity had been given to the matter.
 。‥) Dead birds of the same species as those found in agricultural areas had been found along coastal areas where no farming took place.

  8.Teenagers are often priced out of the labor market by the government-mandated minimum-wage level because employers cannot afford to pay that much for extra help. Therefore, if Congress institutes a subminimum wage, a new lower legal wage for teenagers, the teenage unemployment rate, which has been rising since 1960, will no longer increase.Which of the following, if true, would most weaken the argument above?

 。ˋ) Since 1960 the teenage unemployment rate has risen when the minimum wage has risen.
 。˙) Since 1960 the teenage unemployment rate has risen even when the minimum wage remained constant.
 。–) Employers often hire extra help during holiday and warm weather seasons.
 。―) The teenage unemployment rate rose more quickly in the 1970's than it did in the 1960's.
 。‥) The teenage unemployment rate has occasionally declined in the years since 1960.

  9.Which of the following best completes the passage below?The computer industry's estimate that it loses millions of dollars when users illegally copy programs without paying for them is greatly exaggerated. Most of the illegal copying is done by people with no serious interest in the programs. Thus, the loss to the industry is much smaller than estimated because______

 。ˋ) many users who illegally copy programs never find any use for them
 。˙) most of the illegally copied programs would not be purchased even if purchasing them were the only way to obtain them
 。–) even if the computer industry received all the revenue it claims to be losing, it would still be experiencing financial difficulties
 。―) the total market value of all illegal copies is low in comparison to the total revenue of the computer industry
 。‥) the number of programs that are frequently copied illegally is low in comparison to the number of programs available for sale

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