以下将为正在备战GMAT考试的同学们整理一些经典的GMAT阅读试题，并分多个合集推出，希望能够为正在备考GMAT考试的考生提供或多或少的帮助。

　　31: The primary purpose of the passage is to

　　A. point out some of the differences between dominant and keystone species

　　B. emphasize the complexity of the interactions that occur between two particular species

　　C. detail the fect of a particular habitat on the role occupied by a certain keystone species

　　D. illustrate the importance of community diversity for the perpetuation of an ecosystem

　　E. explain some considerations involved in determining whether a species occupies a keystone role

　　32: Which of the following, if true, would most clearly support the argument about keystone status advanced in the last sentence of the passage (lines 15 – 19)?

　　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 play that 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 fect on the ecosystem it habits.

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

　　33: 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 particularecosystem 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.

　　以上就是本期GMAT试题的所有内容，考生可以此为据并进行针对性的练习，逐步掌握GMAT阅读的解题规律及技巧，以达到迅速提高GMAT考试成绩的目的。 相关链接：

1.GMAT考试资料：GWD试题合集（五十五）

2.GMAT考试资料：GWD试题合集（五十四）

3.GMAT考试资料：GWD试题合集（五十三）

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