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OG18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。
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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 mains 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.

he 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-P451-582题】

It can be inferred that on the basis of the 1981 discovery of conodont remains, paleontologists could draw which of the following conclusions?

  • 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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当前版本由 百香果蜂蜜茶 更新于2017-08-10 15:25:24 感谢由 百香果蜂蜜茶 对此题目的解答所做出的贡献。

A选项(错)第二段中说到一部分专家认为早期的vertebrate属于feeders,但1981的evidence却说 vertebrate是predator

B选项(对)定位第三段这一句话“they were more primitive than the ostracoderms”所以可以看出Os 并不是最早的

C选项(错)传统的专家认为“teeth were adapted from bony scales that provided defensive armor”而1981的evidence 后来证明 “Teeth were more primitive than external armor according to this view”

D选项(错)错在题目让我们基于原文的信息来推到结论,而该答案的内容属于原文重现

E选项(错)第三段已经明确表明conodonts 很有可能是predators


题目讨论 10条评论)

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    园园爱吃肉

    1981代表的是一个大的观点而不是某个观点里的某个小时间点,所以定位的时候更需要从全文去提炼总结,或者通过选项定位
    0 0 回复 2019-12-07 17:53:32
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    245240abh

    直接定位到第一段1981去了……什么都没找到
    0 0 回复 2019-12-01 19:18:57
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    该用户没有名字

    feeder和predator ,好像没区别吧,一个是进食者一个是捕猎者
    0 0 回复 2019-11-10 09:24:27
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    7777777777777

    我觉得,这篇文章只要搞清楚1981的研究到底支持了什么就不会太难选,没必要一个一个定位,读的时候可以在脑中大致分为两个对立方,很显然只有b才是1981支持的观点
    0 0 回复 2019-11-09 16:19:40
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    432442ba

    文章得出的最终结论就是在第三段,所以第一题和第三题其实本质都差不多,都是要得出最终结论。
    0 0 回复 2019-10-11 22:21:02
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    Jillyz

    感觉难的是定位耶,说1981一下子就直接定位到第一段去了。真正说到o的地方不细看根本不会想到这也是based on the research的。太惨了。
    0 0 回复 2019-08-11 03:20:08
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    huang642

    是我太菜了么。。。。感觉这篇是我做过最蛋疼的
    0 0 回复 2019-05-02 03:59:27
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      Sssylvia回复huang642

      是真的难。。我五道题全错了hhhh 读完文章都是一脸懵逼 心态爆炸

      0 0 回复 2019-06-02 17:02:39

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      333234evwgt回复 Sssylvia

      为什么是五道题,不是一共三道题吗?

      0 0 回复 2019-11-03 20:59:53

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    罗congming

    我实在没有找到解析说的第三段这一句话“they were more primitive than the ostracoderms”在哪里
    0 0 回复 2019-03-16 12:05:33
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      浪逐曲奇回复罗congming

      文章倒数第三行到倒数第二行

      0 0 回复 2019-08-14 22:47:31

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    mk

    这一个阅读怎么都是根据选项定位?不合常理啊
    0 0 回复 2019-02-10 01:38:51
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    UomoVitruviano

    真狠啊,原文重述不算数
    0 0 回复 2018-12-17 22:11:52
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      浪逐曲奇回复UomoVitruviano

      感觉已经有更好的选项在了 最好的选项在原文基础上往前推了一步。所以原文重现就不太好了

      0 0 回复 2019-08-14 22:48:47

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      奶油薄荷橘回复UomoVitruviano

      D错其实是错在Paired eyes and adaptations for activity是之前已经明确知道的vertebrates特征,不是这个实验得出的结论

      0 0 回复 2019-09-16 16:32:36

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