Reading Comprehension
试题详情
文章：
| Line | Conodonts, the spiky phosphatic remains (bones |
| and teeth composed of calcium phosphate) of | |
| tiny marine animals that probably appeared about | |
| 520 million years ago, were once among the most | |
| (5) | controversial of fossils. Both the nature of the |
| organism to which the remains belonged and the | |
| function of the remains were unknown. However, | |
| since the 1981 discovery of fossils preserving not | |
| just the phosphatic elements but also other remains | |
| (10) | 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. | |
| (15) | 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- | |
| (20) | 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 | |
| (25) | secondary features, adapted from the protective |
| bony scales. Indeed, external 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. | |
| (30) | 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 | |
| (35) | 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, | |
| (40) | 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 more | |
| primitive than the armored jawless fishes such as the | |
| (45) | 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. |
题目：
It can be inferred that on the basis of the 1981 discovery of conodont remains, paleontologists could draw which of the following conclusions?
选项:
答案:
B
提问：
这道细节图不知道如何定位，看了网上解析觉得B很对，但是在做题的时候该怎么做呢，该用什么定位词定位？如果每个选项取一个定位词回原文找感觉是能找到B选项的，但有什么其他方法更好更快的方法从题干入手找到答案呢，还有，老师顺便帮我讲一下这文章的整体逻辑结构吧😂
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0
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3620
提问：
老师 我选的E 这篇文章其实我是没读懂的 选E的理由是第二段前面说了vertebrates是predator 但是C这个东西跟软骨又放在一起了 我就一脸懵逼的选了E 这个题的定位和思维逻辑我完全看不出来 能不能请老师带着我读一下 感恩~
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1
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