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阅读RC-9220 (第3/8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-P383-444题】

It can be inferred from the passage that which of the following is true of species of terrestrial snakes that often need to assume a vertical posture?

  • 分析A选项
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  • 分析B选项
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  • 分析C选项
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  • 分析D选项
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  • 分析E选项
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暂无雷哥网文字解析
当前版本由 ya**** 更新于2015-10-29 17:16:48 感谢由 ya**** 对此题目的解答所做出的贡献。
文章第三段谈及了陆地蛇的一种——树栖蛇就需要经常表现出垂直姿势,因此正确选项应与第三段中关于树栖蛇的内容相关
A错误,文章没有把海蛇和树栖蛇就是否susceptible to circulatory failure进行比较
B正确,因为树栖蛇的头部与心脏的距离非常近,而海蛇的心脏位于身体的中间
C错误,文章并未将树栖蛇与海蛇相比较
D错误,这是海蛇来到陆地后所表现出的特点
E错误,与文章内容相反

题目讨论 (6条评论)

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    499685skw

    没有理解原题目,assume也有“显露,呈现“的意思。所以问题问的是:下面哪一条关于陆地蛇经常呈现垂直状态的对的?A选项错--陆地蛇已经进化出适应了。B选项正确-陆地蛇进化了,所以心脏在中部的可能比海蛇的可能性要少。C选项 -- 陆地蛇不能像海蛇一样有效的对抗血液在身体底部的堆积(即不能像还海蛇一样很好的把下面的血循环上来) -- 错,其实陆地蛇也有陆地蛇的解决办法,第二段中也说了,pause啊,wave身体呀等等。 D选项 -- 这个是海蛇离开水后的事,跟陆地蛇无关。E选项--错误,陆地蛇可以这么做。
    0 0 回复 2022-10-01 20:05:25
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    想养一只博美

    服了本来想选B,可是想着问infer的话,文章直接给出不算infer吧……搞不懂……哭了
    2 0 回复 2019-10-21 22:48:48
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    AUCHUI

    文章不是说了 the average distance from the heart to the head can be as little as 15 percent of overall body length.为什么还叫推断 不是很明显了吗?
    0 0 回复 2018-12-06 20:35:15
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    默默

    讲位置的
    0 0 回复 2018-05-17 04:55:48
    • 评论用户头像

      雷哥的司机回复默默

      凌晨做题。。。佩服

      0 0 回复 2018-12-04 16:24:28

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    默默

    however 后是重点
    0 0 回复 2018-05-17 04:37:59
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      默默回复默默

      确定受的对象是谁,

      0 0 回复 2018-05-17 04:41:03

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      默默回复默默

      搞清句子成分

      0 0 回复 2018-05-17 04:52:05

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      默默回复默默

      找到从属内容

      0 0 回复 2018-05-17 04:54:54

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    Rubia

    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. 

    海蛇的心脏可以位于身体的中部,这一位置可以将血液循环的血液输送到四肢。然而,在树栖蛇中,住在树上的蛇通常会有垂直的姿势,从心脏到头部的平均距离可能只有全身长度的15%。

    0 0 回复 2017-06-30 15:51:57
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