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 | |
| first vertebrates were predatory. Teeth were more | |
| (35) | 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 | |
| (40) | 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 | |
| ostracoderms. It now appears that the hard parts that | |
| (45) | 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:
A、The earliest vertebrates were sedentary suspension feeders.
B、Ostracoderms were not the earliest vertebrates.
C、Defensive armor preceded jaws among vertebrates.
D、Paired eyes and adaptations for activity are definitive characteristics of vertebrates.
E、Conodonts were unlikely to have been predators.
答案:
B
提问：
请英吉老师解答，其实我瞎整对了，我想请老师看我思路靠不靠谱。
这篇文章我读的是C一开始unkown，可是现在发现了软体remain证明了development of 脊椎动物骨骼。传统学家认为这动物一开始是prey后来进化成predator。另一帮学者认为这动物一直是predator。一堆细节说的是各种器官证明谁比谁早。
读题干问从1981发现中，古生物学家能得出什么结论。我觉得问的是通篇问题，没法定位。通篇说的是发展时间，只有AB沾边，我留下了。然后看A说feeder ，B说大O。我硬着头皮回30行之后找，找到44行大O，说有东西比大O早，A选项没看到信息。我选B。
这种从选项定位，对付出来一个答案的题考试多吗
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