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gre阅读是许多考生难以攻克的大山,下面先来看看GRE阅读高频机经原文及试题:蝴蝶产卵(逻辑),一起来学习吧!

GRE阅读高频机经原文及试题:蝴蝶产卵(逻辑)

蝴蝶产卵(逻辑)

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.

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