新GRE阅读机经：蝴蝶产卵(逻辑).

　　下面是小编为大家整理的新GRE机经的阅读部分，这篇是关于“蝴蝶产卵(逻辑)”的新GRE阅读机经，希望可以帮助各位考生打开阅读思路，提高新GRE阅读能力。

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　　Upon maturity,monarch butterflies travel hundreds of miles from their places of origin and

　　lay their eggs on milkweed. The caterpillars that emerge feed on milkweed and absorb the

　　glycosides in milkweed sap. The specific glycosides present in milkweed differ from region to

　　region within the monarch butterfly’s range. Mature butterflies retain the glycosides in a mature

　　monarch butterfly could be used to determine its place of origin.

　　Which of the following, if true, most strengthens the argument?

　　A. Mature monarch butterflies do not feed on parts of milkweed that contain glycosides.

　　B. The glycosides in milkweed sap are slightly toxic to caterpillars of other species.

　　C. The vast majority of the monarch butterflies that are laying eggs in a given region will

　　have traveled there from a single region.

　　D. There are substances other than glycosides in milkweed sap that accumulate in a

　　monarch caterpillar and are retained in the body of the mature butterfly.

　　E. There are certain glycosides that are found in the sap of all milkweeds, no matter where

　　they grow within the monarch butterfly’s range.

　　25. Sea Cow

　　The dis appearance of Steller&aposs sea cow from the Bering and Copper is lands by 1768 has long

　　been blamed on intensive hunting. But its dis appearance took only 28 years from the time

　　Steller first described the species, a remarkably short time for hunting alone to depopulate the

　　is lands, especially given the large populations initially reported. However, by 1750, huntershad

　　also targeted nearby sea otter populations . Fewer otters would have allowed s ea urchin

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　　populations on which the otterspreyed to expand and the urchins &apos grazing pressure on kelp

　　forests to increase. Sea cows were totally dependent on kelp for food, and within a decade of

　　the onset of otter hunting Steller noted that the is lands&apos sea cows appeared malnourished.

　　1. Which of the following can be inferred from the pas s age about kelp forests in the Bering

　　and Copper is lands between 1750 and 1768?

　　A. They were reduced significantly.

　　B. They disappeared entirely from the region.

　　C. They were the primary food source for sea otters .

　　D. They were harvested in record numbers by humans

　　E. They increased pressure on sea urchin populations.

　　2. According to the pas s age, it is likely that during the m id-1700s, s ea urchin populations

　　near the Bering and Copper is lands

　　A. were diminished by sea cow predation

　　B. experienced substantial increases

　　C. migrated to waters with more plentiful food supplies

　　D. were reduced by the pressures of hunting

　　E. appeared to be malnourished

　　答案：AB

　　以上就是关于“蝴蝶产卵(逻辑)”的新GRE阅读机经，希望能够帮助各位考生更好地备考新GRE。机经的作用是非常重要的，有很多机经会反复考到，大家可以进行认真阅读，从中推断出出题人的出题思路，总结出新GRE阅读的解题，做到杀G成功!