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托福阅读修辞目的题：Begging by Nestlings

2015-08-17 16:00:49来源：网络

　　【托福阅读题型：Begging by Nestlings修辞目的题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之修辞目的题

　　托福阅读修辞目的题：Begging by Nestlings

　　【Paragraph 6】As these experiments show, begging apparently provides a signal of need that parents use to make　judgments about which offspring can benefit most from a feeding. But the question arises, why don't nestlings beg loudly　when they aren't all that hungry? By doing so, they could possibly secure more food, which should result in more rapid　　growth or larger size, either of which is advantageous. The answer lies apparently not in the increased energy costs of　exaggerated begging—such energy costs are small relative to the potential gain in calories—but rather in the damage that　any successful cheater would do to its siblings, which share genes with one another. An individual's success in propagating　his or her genes can be affected by more than just his or her own personal reproductive success. Because close relatives　have many of the same genes, animals that harm their close relatives may in effect be destroying some of their own genes.　Therefore, a begging nestling that secures food at the expense of its siblings might actually leave behind fewer copies of its　genes overall than it might otherwise.(Begging by Nestlings)

　　In paragraph 6, the author compares the energy costs of vigorous begging with the potential gain in calories from　such begging in order to

　　○ explain why begging for food vigorously can lead to faster growth and increased size

　　○ explain how begging vigorously can increase an individual’s chance of propagating its own genes

　　○ point out a weakness in a possible explanation for why nestlings do not always beg vigorously

　　○ argue that the benefits of vigorous begging outweigh any possible disadvantages

　　答案见下一页：

本文关键字: 托福阅读题型 托福阅读训练 修辞目的题

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