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GMAT阅读OG 13 26篇详细分析-22

2014-10-02 19:13:43来源：网络

　　新东方在线为大家精心整理了GMAT阅读OG 13 26篇详细分析的相关内容，分享给大家，供大家参考，希望对大家有所帮助!

　　While the most abundant and dominant species within a particular ecosystem is often crucial in perpetuating the ecosystem, a "keystone" species, here defined as one whose effects are much larger than would be predicted from its abundance, can also play a vital role. But because complex species interactions may be involved, identifying a keystone species by removing the species and observing changes in the ecosystem is problematic. It might seem that certain traits would clearly define a species as a keystone species; for example, Pisaster ochraceus is often a keystone predator because it consumes and suppresses mussel populations, which in the absence of this starfish can be a dominant species. But such predation on a dominant or potentially dominant species occurs in systems that do as well as in systems that do not have species that play keystone roles. Moreover, whereas P.ochraceus occupies an unambiguous keystone role on wave-exposed rocky headlands, in more wave-sheltered habitats the impact of P.ochraceus predation is weak or nonexistent, and at certain sites sand burial is responsible for eliminating mussels. Keystone status appears to depend on context, whether of particular geography or of such factors as community diversity (for example, a reduction in species diversity may thrust more of the remaining species into keystone roles) and length of species interaction (since newly arrived species in particular may dramatically affect ecosystems). [Line 24-31]

　　Questions 111-114 refer to the passage above.

　　111. The passage mentions which of the following as a factor that affects the role of P.ochraceus as a keystone species within different habitats?

　　A. The degree to which the habitat is sheltered from waves

　　B. The degree to which other animals within a habitat prey on mussels

　　C. The fact that mussel populations are often not dominant within some habitats occupied by P.ochraceus

　　D. The size of the P. ochraceus population within the habitat

　　E. The fact that there is great species diversity within some habitats occupied by P.ochraceus

　　112. Which of the following hypothetical experiments most clearly exemplifies the method of identifying species' roles that the author considers problematic?

　　A. A population of seals in an Arctic habitat is counted in order to determine whether it is the dominant species in that ecosystem.

　　B. A species of fish that is a keystone species in one marine ecosystem is introduced into another marine ecosystem to see whether the species will come to occupy a keystone role.

　　C. In order to determine whether a species of monkey is a keystone species within a particular ecosystem, the monkeys are removed from that ecosystem and the ecosystem is then studied.

　　D. Different mountain ecosystems are compared to determine how geography affects a particular species' ability to dominate its ecosystem.

　　E. In a grassland experiencing a changing climate, patterns of species extinction are traced in order to evaluate the effect of climate changes on keystone species in that grassland.

　　113. Which of the following, if true, would most clearly support the argument about keystone status advanced in the last sentence of the passage (lines 24-31)?

　　A. A species of bat is primarily responsible for keeping insect populations within an ecosystem low, and the size of the insect population in turn affects bird species within that ecosystem.

　　B. A species of iguana occupies a keystone role on certain tropical islands, but does not playthat role on adjacent tropical islands that are inhabited by a greater number of animal species.

　　C. Close observation of a savannah ecosystem reveals that more species occupy keystone roles within that ecosystem than biologists had previously believed.

　　D. As a keystone species of bee becomes more abundant, it has a larger effect on the ecosystem it inhabits.

　　E. A species of moth that occupies a keystone role in a prairie habitat develops coloration patterns that camouflage it from potential predators.

　　114. The passage suggests which of the following about the identification of a species as a keystone species?

　　A. Such an identification depends primarily on the species' relationship to the dominant species.

　　B. Such an identification can best be made by removing the species from a particular ecosystem and observing changes that occur in the ecosystem.

　　C. Such an identification is likely to be less reliable as an ecosystem becomes less diverse.

　　D. Such an identification seems to depend on various factors within the ecosystem.

　　E. Such an identification can best be made by observing predation behavior.

　　题材：Biology

　　类型：描述型

　　框架：keystone species

　　介绍keystone--但后来发现很难给它下定义--举例--进一步解释--最后决定根据环境来测定它(conclusion: depend on context)

　　逻辑链：

　　1、keystone的定义+举例

　　2、但又在其它情况下很难定义+举例

　　3、结论：depend on context1+2

　　题目类型：111：细节信息 112：演绎题 113：细节题 114：概括题

　　解题定位(根据OG13解释)：

　　111：定位Line18从moreover开始到22行

　　112：根据问题的关键词：problematic，定位Line6-9，但此题是一个演绎题，选项的内容是出题者根据作者的意思编写的，不管主体是否替换，但换汤不换药，抓准remove这个关键词

　　113：看似问的support好像是逻辑题，实际还是细节定位题。定位到Line25-30最后2个方面，一个地理，一个长度，但选项对应哪一个。A讲人口，C与D讲数量，E讲习惯。只有B讲地理

　　114：问的泛，看文章框架，开头说了keystone的定义，后来又说收到环境变化的影响很难定义，此为结论

　　以上就是新东方在线为大家总结的GMAT阅读OG 13 26篇详细分析的相关内容，最后预祝大家在GMAT考试中取得优异的成绩!


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