GMAT逻辑加强题练习题二

　　备考GMAT逻辑的过程中，对于各部分的题型要有充分的了解，这样才能够在考试中能够更好地拿到分数。下面新东方在线GMAT频道为大家整理了一些相关的例题，供大家练习。

点击查看》》》【GMAT逻辑题型讲义汇总】

　　5. Since the routine use of antibiotics can give rise to resistant bacteria capable of surviving 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.

　　6. Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on the fact that different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles, researchers have concluded that the bowerbirds’ building styles are a culturally acquired, rather than a genetically transmitted, trait.

　　Which of the following, if true, would most strengthen the conclusion drawn by the researchers?

　　(A) There are more common characteristics than there are differences among the bower-building styles of the local bowerbird population that has been studied most extensively

　　(B) Young male bowerbirds are inept at bower-building and apparently spend years watching their elders before becoming accomplished in the local bower style.

　　(C) The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.

　　(D) Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.

　　(E) It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.

　　7. Many breakfast cereals are fortified with vitamin supplements. Some of these cereals provide 100 percent of the recommended daily requirement of vitamins. Nevertheless, a well-balanced breakfast, including a variety of foods, is a better source of those vitamins than are such fortified breakfast cereals alone.

　　Which of the following, if true, would most strongly support the position above?

　　(A) In many foods, the natural combination of vitamins with other nutrients makes those vitamins more usable by the body than are vitamins added in vitamin supplements.

　　(B) People who regularly eat cereals fortified with vitamin supplements sometimes neglect to eat the foods in which the vitamins occur naturally.

　　(C)Foods often must be fortified with vitamin supplements because naturally occurring vitamins are removed during processing.

　　(D) Unprocessed cereals are naturally high in several of the vitamins that are usually added to fortified breakfast cereals.

　　(E) Cereals containing vitamin supplements are no harder to digest than similar cereals without added vitamins.

　　8. Half of the subjects in an experiment—the experimental group—consumed large quantities of a popular artificial sweetener. Afterward, this group showed lower cognitive abilities than did the other half of the subjects—the control group—who did not consume the sweetener. The detrimental effects were attributed to an amino acid that is one of the sweetener’s principal constituents.

　　Which of the following, if true, would best support the conclusion that some ingredient of the sweetener was responsible for the experimental results?

　　(A) Most consumers of the sweetener do not consume as much of it as the experimental group members did.

　　(B) The amino acid referred to in the conclusion is a component of all proteins, some of which must be consumed for adequate nutrition.

　　(C) The quantity of the sweetener consumed by individuals in the experimental group is considered safe by federal food regulators.

　　(D) The two groups of subjects were evenly matched with regard to cognitive abilities prior to the experiment.

　　(E) A second experiment in which subjects consumed large quantities of the sweetener lacked a control group of subjects who were not given the sweetener.

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