2011年GMAT逻辑推理试题训练69

    26. A conservation group in the United States is trying to change the long-standing image of bats 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 group's contention？

    （A） Bats are steadily losing natural roosting places such as caves and hollow rees and are thus turning to more developed areas for roosting.

    （B） Bats are the chief consumers of nocturnal insects and thus can help make their hunting territory more pleasant for humans.

    （C） Bats 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.

    27.The population of peregrine falcons declined rapidly during the 1950's and 1960's and reached an all-time low in the early 1970's. The decline was attributed by scientists to the widespread use of the pesticide DDT in rural areas. Which of the following， if true， gives the strongest support to the scientists claim？

    （A） DDT was not generally in use in areas devoted to heavy industry.

    （B） In the time since the use of DDT was banned in 1972， the population of peregrine falcons has been steadily increasing.

    （C） Peregrine falcons， like other birds of prey， abandon eggs that have fallen out of the nest， even if the eggs remain intact.

    （D） Starlings， house sparrows， and blue jay-birds the peregrine falcon preys on-were not adversely affected by DDT in their habitats.

    （E） Other birds of prey， such as the osprey， the bald eagle， and the brown pelican， are found in the same areas as is the peregrine falcon.

    28.The town of Stavanger， Norway， was quiet and peaceful until the early 1960's， when Stavanger became Norway's center for offshore oil exploration. Between then and now， violent crime and vandalism in Stavanger have greatly increased. Clearly， these social problems are among the results of Stavanger's oil boom. Which of the following， if it occurred between the early 1960's and now， give the strongest support to the argument above？

    （A） The people of Stavanger rarely regret that their town was chosen to be Norway's center for offshore oil exploration.

    （B） Norwegian sociologists expressed grave concern about the increase in violent crime and vandalism in Stavanger.

    （C） Violent crime and vandalism have remained low in Norwegian towns that had no oil boom.

    （D） Nonviolent crime， drug addiction， and divorce in Stavanger increased approximately as much as violent crime and vandalism did.

    （E） The oil boom necessitated the building of wider roads for the increased traffic in Stavanger.

    29.In the aftermath of a worldwide stock-market crash， Country T claimed that the severity of the stock-market crash it experienced resulted from the accelerated process of denationalization many of its industries underwent shortly before the crash. Which of the following， if it could be carried out， would be most useful in an evaluation of Country T's assessment of the causes of the severity of its stock-market crash？

    （A） Calculating the average loss experienced by individual traders in Country T during the crash

    （B） Using economic theory to predict the most likely date of the next crash in Country T

    （C） Comparing the total number of shares sold during the worst days of the crash in Country T to the total number of shares sold in Country T just prior to the crash.

    （D） Comparing the severity of the crash in Country T to the severity of the crash in countries otherwise economically similar to Country T that have not experienced recent denationalization

    （E） Comparing the long-term effects of the crash on the purchasing power of the currency of Country T to the immediate， more severe short-term effects of the crash on the purchasing power of the currency of Country T.

    30.In the 1960's . long-term studies of primate behavior often used as subjects tamarinds， small monkeys that were thought ideal because they require only small cages， bread frequently， and grow quickly. Field studies were not used because they were costly and difficult. Tamarinds were kept caged in male-female pairs， because otherwise， serious fights erupted between unrelated females. On the basis of the fact that breeding occurred， tama tins were viewed as monogamous. The view taken by the researchers concerning the monogamy of tamarinds depended on a questionable assumption. Which of the following could have served as that assumption？

    （A） The suppression of fighting between related females serves to protect their common genetic inheritance.

    （B） Adult male tama tins contribute to the care of tamarind infants.

    （C） The social system of tamarinds requires monogamous pairing.

    （D） Male tamarind monkeys do not display aggressive behavior in the wild.

    （E） The way the tamarinds were kept in cages did not affect their mating behavior.

    Keys：DBCDE