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OG20官方指南,建议同学们刷3遍。第一遍做题了解题型和考点,第二遍精刷,第三遍集中解决疑难问题。建议考生第一遍刷题采用官方正版纸质书籍,若遇到疑难问题,欢迎在此专区查阅解析,提供解析,参与题目讨论,与所有考生一起解决疑难问题。
阅读RC-15423 (第1/3题) Time Cost00:00
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该题平均耗时:5m48s,平均正确率:39.4%

建议使用官方纸质指南,查看对照完整题目

Conodonts, the spiky phosphatic remains (bones and teeth composed of calcium phosphate) of tiny marine animals that probably appeared about 520million years ago, were once among the most controversial of fossils. Both the nature of the organism to which the remains belonged and the function of there remains were unknown. However,since the 1981 discovery of fossils preserving not just the phosphatic elements but also other remains of the tiny soft-bodied animals (also called conodonts) that bore them, scientists' reconstructions of the animals' anatomy have had important implications for hypotheses concerning the development of the vertebrate skeleton.

The vertebrate skeleton had traditionally been regarded as a defensive development, champions of this view postulating that it was only with the much later evolution of jaws that vertebrates became predators. The first vertebrates,which were soft-bodied, would have been easy prey for numerous invertebrate carnivores, especially if these early vertebrates were sedentary suspension feeders. Thus, traditionalists argued, these animals developed coverings of bony scales or plates, and teeth were secondary features, adapted from the protective bony scales. Indeed, externa! skeletons of this type are common among the well-known fossils of ostracoderms, jawless vertebrates that existed from approximately 500 to 400 million years ago.However,other paleontologists argued that many of the definitive characteristics of vertebrates, such as paired eyes and muscular and skeletal adaptations for active life, would not have evolved unless the first vertebrates were predatory. Teeth were more primitive than external armor according to this view, and the earliest vertebrates were predators.

The stiffening notochord along the back of the body, V-shaped muscle blocks along the sides, and posterior tail fins help to identify conodonts as among the most primitive of vertebrates. The lack of any mineralized structures apart from the elements in the mouth indicates that conodonts were moreprimitive than the armored jawless fishes such as the ostracoderms. It now appears that the hard parts that first evolved in the mouth of an animal improved its efficiency as a predator, and that aggression rather than protection was the driving force behind the origin of the vertebrate skeleton.

【OG20-P450-580题】

According to the passage, the anatomical evidence provided by the preserved soft bodies of conodonts led scientists to conclude that

  • 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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该题目由网友pbStud提供。更多GMAT题目请
暂无雷哥网文字解析
当前版本由 百香果蜂蜜茶 更新于2017-08-10 14:42:33 感谢由 百香果蜂蜜茶 对此题目的解答所做出的贡献。

这一题让我们基于文章当中的信息来给定一个合理的推断,所以首先要找到文章当中所出现的所有关于Conodont的信息,然后再根据每个答案当中出现的名词 回到原文中进行定位,最后看这些名词与conodon之间的关系。

A选项(错)文章已经很清晰的表明 conodon不是“invertebrate”而是“vertebrate”

B选项(错)原文提到的原句是:B选项提及的内容在第二段有提到,不过立马被第三段给否定了“Teeth were more primitive than external armor according to this view, and the earliest vertebrates were predators”

C选项(错) 最后一段已经说了很明显了 conodon 是predator 而不是 feeder

D选项(对) 请定位第三段, 合理的支撑

E选项(错)从文章的结尾可以看出, 最后作者一开始被提出来的结论被推翻了!


题目讨论 10条评论)

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  • 用户头像

    如果有时间的话我也能做对

    The stiffening notochord软脊椎的变硬 along the back of the body, V-shaped muscle blocks along the sides, and posterior tail fins-这一堆也就是解刨学证据 help to identify (对应conclude)conodonts as among the most primitive of vertebrates. The lack of any mineralized structures apart from the elements in the mouth ( teeth appeared嘴里的元素)indicates that conodonts were (!重点)more primitive than( D选项earlier than) the armored jawless fishes (也就是 armored vertebrates)such as the ostracoderms。所以D是文章结论句的精华提取。
    0 0 回复 2021-08-01 16:02:11
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    弹钢琴的小胖手

    这片文章精读了一遍才只对了1道题,恐怖蒙着做题正确率没准都比这个高吧
    1 0 回复 2021-07-08 15:22:54
    • 评论用户头像

      如果有时间的话我也能做对回复弹钢琴的小胖手

      事实证明你经常都是对的

      0 0 回复 2021-08-01 16:02:07

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    ycg200650

    看你们的评论是我做题快乐的源泉
    0 0 回复 2021-06-26 11:23:05
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    507688pt

    不认识的单词一堆一堆的。。。
    1 0 回复 2021-03-29 22:36:53
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    DamienExam

    彻底干懵了
    1 0 回复 2021-02-14 16:33:04
  • 用户头像

    570239pybw

    这是人做的题吗
    2 0 回复 2021-01-26 20:42:03
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    219371eoeh

    这篇给我看得丧的哟,打击哭了
    0 1 回复 2021-01-08 23:05:58
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    169343coqj

    这种阅读考试的时候碰着了我瞎蒙可能比认真读正确率高哦
    2 1 回复 2020-12-22 19:15:16
    • 评论用户头像

      弹钢琴的小胖手回复169343coqj

      我,精读了一遍,不认识的词全都查词典,只对一道题。

      0 0 回复 2021-07-08 15:23:40

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    Mariposa爱学习

    用这道题练习写逻辑图
    每段话聊了不同的话题,前面两段都出现了however,并且however前面的是作者赞同的,后面是作者不赞同的
    E选项出现的关键词phosphatic,位于however后面,是作者赞同内容
    0 0 回复 2020-11-14 18:08:52
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    746860xgow

    注意题干问得是得出什么结论
    D直接定位第二段最后一句more primitive = appear earlier 
    C最多是原文的一处细节,根本不是结论
    0 0 回复 2020-05-22 06:42:25
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