GMAT考试在3月2日换库，楷维留学小编为大家特别为大家整理分享了3月份GMAT阅读机经，这篇GMAT阅读机经是关于飞蛾数量周期性变化原因的文章，下面的内容为考古内容，考生朋友可以参考一下，希望对大家有所帮助。

　　机经每天可能都有大量更新或者版本补充，建议大家随时关注楷维留学指南的GMAT机经板块，我们经迅速及时的更新GMAT机经。

　　[V1]

　　有一篇讲热带雨林的caterpillar.说caterpillar population fluctuation是因为什么, 下一段还提到了一种neural p.. virus(有讨论这个东西对population的影响)

　　[V2]

　　阅读还考了那个 蝴蝶life cycle的，就是population有一个cycle。

　　[V3]

　　考了一种动物的population cycle。机经上有。就是不是因为捕食者而导致的，是一种virus导致的，这种virus会存活啥的啥的。

　　考古已确认(原题，连题目都一样!)(还是提醒大家，注意变体!!)

　　老新观点

　　1P: population cycle, identify driving force, however, surprising elusive. Common approach unproductive; ecologist’s attempt, not succeed. In short, population regulated by intimated connected with insects.

　　2P: recent work suggest virus. Contributed to. Recent work made possible by new techniques. NP hypothesized because…

　　3P: attractions of hypothesis is ….

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　　T-9-20:GWD-13-34:

　　Which of the following, if true, would most weaken the author’s conclusion in lines 25-30?

　　A. New research reveals that the number of species of birds and parasites that prey on lepidoptera has dropped significantly in recent years.

　　B. New experiments in which the habitats of lepidoptera are altered in previously untried ways result in the shortening of lepidoptera population cycles.

　　C. Recent experiments have revealed that the nuclear polyhedrosis virus is present in a number of predators and parasites of lepidoptera.

　　D. Differences among the habitats of lepidoptera species make it difficult to assess the effects of weather on lepidoptera population cycles.

　　E. Viral disease is typically observed in a large proportion of the lepidoptera population.

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　　T-9-21:GWD-13-35:

　　It can be inferred from the passage that the mortality caused by agents such as predatory birds or parasites was measured in an attempt to

　　A. develop an explanation for the existence of lepidoptera population cycles

　　B. identify behavioral factors in lepidoptera that affect survival rates

　　C. identify possible methods for controlling lepidoptera population growth

　　D. provide evidence that lepidoptera populations are self-regulating

　　E. determine the life stages of lepidoptera at which mortality rates are highest

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　　T-9-22:GWD-13-36:

　　The primary purpose of the passage is to

　　A. describe the development of new techniques that may help to determine the driving force behind population cycles in Lepidoptera

　　B. present evidence that refutes a particular theory about the driving force behind population cycles in Lepidoptera

　　C. present a hypothesis about the driving force behind population cycles in Lepidoptera

　　D. describe the fluctuating patterns of population cycles in Lepidoptera

　　E. question the idea that a single driving force is behind population cycles in Lepidoptera

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　　T-9-23:GWD-13-37:

　　According to the passage, before the discovery of new techniques for detecting viral DNA, population ecologists believed that viral diseases

　　A. were not widely prevalent among insect populations generally

　　B. affected only the caterpillar life stage of lepidoptera

　　C. were the driving force behind lepidoptera population cycles

　　D. attacked already declining caterpillar populations

　　E. infected birds and parasites that prey on various species of Lepidoptera

　　一种飞蛾，他们的数量有周期性的变化。但是一开始，科学家用常规的方法都没有测量出来引起周期性变化的原因，既不是生存地的条件，也不是捕食者的数量。后来科技发展，科学家发现应该是一种病毒。这个病毒会保存在一种晶体里面，晶体被飞蛾吃掉后，外壳就融化，然后病毒在飞蛾体内繁殖，同时包裹上晶体，等飞蛾死掉，那些晶体就落在土壤里了。然后这个发现很有意义，因为很多别的种类的飞蛾也可能是这个原因。

　　以上就是关于飞蛾数量周期性变化原因的GMAT阅读机经的全部内容，考生可以有选择的看看，机经虽好，但是也要适度哟。