GMAT逻辑归纳题在线练习一

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点击查看》》》【GMAT逻辑题型讲义汇总】

　　1. Advertisement: Today's customers expect high quality. Every advance in the quality of manufactured products raises customer expectations. The company that is satisfied with the current quality of its products will soon find that its customers are not. At MegaCorp, meeting or exceeding customer expectations is our goal.

　　Which of the following must be true on the basis of the statements in the advertisement above?

　　(A) MegaCorp's competitors will succeed in attracting customers only if those competitors adopt MegaCorp's goal as their own.

　　(B) A company that does not correctly anticipate the expectations of its customers is certain to fail in advancing the quality of its products.

　　(C) MegaCorp's goal is possible to meet only if continuing advances in product quality are possible.

　　(D) If a company becomes satisfied with the quality of its products, then the quality of its products is sure to decline.

　　(E) MegaCorp's customers are currently satisfied with the quality of its products.

　　2. Social scientists are underrepresented on the advisory councils of the National Institutes of Health (NIH). Since these councils advise NIH directors and recommend policy, the underrepresentation of social scientists results in a relative lack of NIH financial support for research in the social sciences.

　　If the statements above are correct, they most strongly support which of the following?

　　(A) A significant increase in the size of NIH advisory councils would be required in order to increase the representation of social scientists on these councils.

　　(B) A significant increase in the representation of social scientists on NIH advisory councils would result in an increase in NIH funding for social science research.

　　(C) A significant increase in funding for social science research would result in improved policy' recommendations to NIH directors.

　　(D) A significant increase in funding for the training of social scientists would result in an increase in the number of social scientists on NIH advisory councils.

　　(E) A significant increase in the representation of social scientists on NIH advisory councils would have to precede any increase in the number of NIH directors who are social scientists.

　　3.(Z7-13)Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.

　　Fact: over 95 percent of people who have asthma also suffer from hay fever.

　　If the information given as facts above is true, which of the following must also be true?

　　A. Hay fever is a prerequisite for the development of asthma

　　B. Asthma is a prerequisite for the development of hay fever

　　C. Those who have neither hay fever nor asthma comprise less than 5 percent of the total population

　　D. The number of people who have both of these ailments is greater than the number of people who have only one of them

　　E. The percentage of people suffering from hay fever who also have asthma is lower than 95 percent.

　　4. (Z8-30)The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality. The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil’s acidity.

　　If the statements above are all true, which of the following conclusions is best supported by them?

　　A. When an olive oil is refined, the concentration of oleic acid in the oil is reduced.

　　B. The quality of an unrefined olive oil can be determined only by accurately measuring its acidity.

　　C. If an unrefined olive oil is intermediate in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.

　　D. Free oleic acid is the only acid that unrefined olive oil contains.

　　E. People who judge the quality of unrefined olive oils actually judge those oils by their acidity, which the judges can taste.

　　5.(Z11-23)Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria. Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria.

　　The statements above, if true, provide the most support for which of the following conclusions?

　　A. Mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way.

　　B. Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections.

　　C. In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.

　　D. When a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouse’s body decreases.

　　E. Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection.

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