GMAT考试资料：GWD试题合集（二）.

　　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。

　　GWD-1-Q9:

　　The primary purpose of the passage is to

　　A. argue against a conventional explanation for the extinction of certain salmon populations and suggest an alternative

　　B. correct a common misunderstanding about the behavior of salmon in response to environmental degradation caused by human activity

　　C. compare the fects of human activity on salmon populations with the fects of natural disturbances on salmon populations

　　D. differentiate the particular fects of various human activities on salmon habitats

　　E. describe how environmental degradation can cause changes in salmon populations that extend beyond a numerical reduction

　　The numerical fect is obvious: there are fewer salmon in degraded regions than in pristine ones; however, habitat loss also has the potential to reduce genetic diversity. Indeed, most analysts believe that some kind of environmental degradation underlies the demise of many extinct salmon populations.

　　注意extend beyond和主题句中的however, reduce genetic diversity

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　　*GWD-1-Q10:

　　It can be inferred from the passage that the occasional failure of some salmon to return to their natal streams in order to spawn provides a mechanism by which

　　A. pristine streams that are near polluted streams become polluted themselves

　　B. the particular adaptations of a polluted stream’s salmon population can be preserved without dilution迷惑选项

　　C. the number of salmon in pristine habitats decreases relative to the number in polluted streams

　　D. an environmentally degraded stream could be recolonized by new salmon populations should the stream recover定位36-40

　　Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism by which a location can be repopulated should the fish there disappear.

　　Should=if

　　E. the extinction of the salmon populations that spawn in polluted streams is accelerated

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　　GWD-1-Q11:

　　According to the passage, human activity has had which of the following fects on salmon populations?

　　A. An increase in the size of salmon populations in some previously polluted rivers

　　B. A decline in the number of salmon in some rivers定位第一段Line 1-7

　　C. A decrease in the number straying salmon in some rivers

　　D. A decrease in the gene flow between salmon populations that spawn in polluted streams and populations that spawn in pristine streams

　　E. A decline in the vulnerability of some salmon populations to the fects of naturally occurring habitat destruction

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　　*GWD-1-Q12:

　　The author mentions the “aftermath of the Mount Saint Helens eruption” (lines 73-74) most likely in order to

　　A. provide an example of the process that allows the repopulation of rivers whose indigenous salmon population has become extinct

　　B. indicate the extent to which the disturbance of salmon habitat by human activity in one stream might affect the genetic structure of salmon populations elsewhere 但是有一点，文中说的是影响genetic flow而这里说的是genetic structure

　　C. provide a standard of comparison against which the impact of human activity on the gene flow among salmon populations should be measured无关，没有提到要衡量，文中强调的是人类活动对洄游的影响

　　D. show how salmons’ homing instinct can be impaired as a result of severe environmental degradation of their natal streams

　　E. show why straying rates in salmon populations remain generally low except when spawning streams suffer severe environmental disturbance

　　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（一）

2.浅析GMAT阅读的提升技巧

3.GMAT备考经验分享：不要忽视阅读和逻辑(一)

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