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阅读RC-9234 (第7/8题) Time Cost00:00
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In terrestrial environments, gravity places special demands on the cardiovascular systems of animals. Gravitational pressure can cause blood to pool in the lower regions of the body, making it difficult to circulate blood to critical organs such as the brain. Terrestrial snakes, in particular, exhibit adaptations that aid in circulating blood against the force of gravity.

The problem confronting terrestrial snakes is best illustrated by what happens to sea snakes when removed from their supportive medium. Because the vertical pressure gradients within the blood vessels are counteracted by similar pressure gradients in the surrounding water, the distribution of blood throughout the body of sea snakes remains about the same regardless of their orientation in space, provided they remain in the ocean. When removed from the water and tilted at various angles with the head up, however, blood pressure at their midpoint drops significantly, and at brain level falls to zero. That many terrestrial snakes in similar spatial orientations do not experience this kind of circulatory failure suggests that certain adaptations enable them to regulate blood pressure more effectively in those orientations.

One such adaptation is the closer proximity of the terrestrial snake’s heart to its head, which helps to ensure circulation to the brain, regardless of the snake’s orientation in space. The heart of sea snakes can be located near the middle of the body, a position that minimizes the work entailed in circulating blood to both extremities. In arboreal snakes, however, which dwell in trees and often assume a vertical posture, the average distance from the heart to the head can be as little as 15 percent of overall body length. Such a location requires that blood circulated to the tail of the snake travel a greater distance back to the heart, a problem solved by another adaptation. When climbing, arboreal snakes often pause momentarily to wiggle their bodies, causing waves of muscle contraction that advance from the lower torso to the head. By compressing the veins and forcing blood forward, these contractions apparently improve the flow of venous blood returning to the heart.

【OG18-P384-448题】The primary purpose of the third paragraph is to

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  • 分析B选项
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  • 分析C选项
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当前版本由 ya**** 更新于2015-10-28 16:40:27 感谢由 ya**** 对此题目的解答所做出的贡献。
本文第三段主要论述了陆地蛇应对重力效应的另外一个特点,即心脏和头部的距离短,并举树栖蛇为例进行说明
A错误,第三段并没有开始新的话题
B错误,没有提及more efficient method
C错误,没有得出结论,结论在第一段已经给出
D正确,很好地总结了第三段的内容
E错误,第三段没有提到undermines a view reported earlier in the passage;第三段首句的One such adaptation说明第三段与第二段是承接关系

题目讨论 (8条评论)

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  • 用户头像
    ydissacyr

    第三段开头One such adaptation承上启下句,表明第三段要承接第二段说的;
    B选项describe a more efficient method,如果B正确那么肯定会有两种方法的比较,然而没有;
    而D选项,The heart of sea snakes can be located near the middle of the body这是第一个例子,In arboreal snakes, however, which...the average distance from the heart to the head can be as little as 15 percent of overall body length.这是第二个例子。
    0 0 回复 2021-05-25 09:40:46
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    Stanley想去荷兰

    第三段开头one such ……is 明显是承接上文,回到第二段末尾看suggests that certain adaptations enable them to regulate blood pressure more effectively in those orientations.说明第三段要来说明血液流通的事
    1 0 回复 2019-12-18 17:01:00
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    cindy710

    上文结尾说了有adaptation ;
    P3 段首就说One such adaptation is  
    → 给出例子1;terrestrial snake’s 
    然后说到 arboreal snakes, however,
    →递进例子
    所以是两个例子;
    空气蛇 是ter 蛇的其中一种,用 however递进连接
    2 0 回复 2019-07-22 21:56:34
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    huang642

    第三段就是说了上一段结尾的:certain adaptations enable them to regulate blood pressure more effectively in those orientations.
    
    两种蛇:一种心脏在身体中间的
    一种心脏离头很近的
    0 0 回复 2019-05-21 04:02:49
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    妞妞的大奋斗

    比较选项 并且要搞懂这段话的定位 比如 example, method ,conclusion ,evidence之类的 。以及相关动词
    0 0 回复 2018-06-22 15:59:43
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    妞妞的大奋斗

    分析某段的作用 一定要先看上下段的首尾句和本段的关系
    0 0 回复 2018-06-22 15:57:20
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    默默

    第三段明显是在列举
    0 0 回复 2018-05-17 05:14:35
    • 评论用户头像

      默默回复默默

      B说更有效,就表示有比较,但前面没说比较

      0 0 回复 2018-05-17 05:25:06

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    Rubia

    第三段第一句 one such adaptation;第四句 a problem solved by another adaptation;说明这段讨论了两个adaptation 并举了例子。

    0 0 回复 2017-06-30 15:23:40
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