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托福阅读句子简化题：A Warm-Blooded Turtle

2015-08-18 17:02:01来源：网络

　　【托福阅读题型：A Warm-Blooded Turtle句子简化题】托福阅读中句子简化题是重要题型之一。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句子简化题

　　托福阅读句子简化题：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)

　　! Which of the sentences below best expresses the essential information in the highlighted sentence in the　passage? Incorrect choices change the meaning in important ways or leave out essential information.

　　○In a turtle's countercurrent exchange system, outgoing vessels lie near enough to ingoing ones that heat can be　exchanged from the former to the latter before reaching the turtle's flippers.

　　○Within the turtle's flippers, there is a countercurrent exchange system that allows colder blood vessels to absorb heat　from nearby warmer blood vessels and then return warmed blood to the turtle's body.

　　○In a countercurrent exchange system, a turtle can pick up body heat from being close enough to other turtles, thus　raising its blood temperature as it passes them.

　　○When a turtle places its flippers close to its body, it is able to use its countercurrent exchange system to transfer heat　from the warmer blood vessels in its body to the cooler blood vessels in its flippers.



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