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托福阅读修辞目的题：A Warm-Blooded Turtle

2015-08-12 17:07:01来源：网络

　　【托福阅读题型：A Warm-Blooded Turtle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：A Warm-Blooded Turtle

　　【Paragraph 5】In a countercurrent exchange system, the blood vessels carrying cooled blood from the　flippers run close enough to the blood vessels carrying warm blood from the body to pick up some heat from the　warmer blood vessels; thus, the heat is transferred from the outgoing to the ingoing vessels before it reaches the　flipper itself. This is the same arrangement found in an old-fashioned steam radiator, in which the coiled pipes pass　heat back and forth as water courses through them. The leatherback is certainly not the only animal with such an　arrangement; gulls have a countercurrent exchange in their legs. That is why a gull can stand on an ice floe without　freezing.(A Warm-Blooded Turtle)

　　Why does the author mention old-fashioned steam radiator in the discussion of countercurrent exchange　systems?

　　○To argue that a turtle's central heating system is not as highly evolved as that of other warmblooded animals

　　○To provide a useful comparison with which to illustrate how a countercurrent exchange system works

　　○To suggest that steam radiators were modeled after the sophisticated heating system of turtles

　　○To establish the importance of the movement of water in countercurrent exchange systems

　　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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