还没有登录哦！
[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：
According to the passage, the anatomical evidence provided by the preserved soft bodies of conodonts led scientists to conclude that
选项:
A、conodonts had actually been invertebrate carnivores
B、conodonts’ teeth were adapted from protective bony scales
C、conodonts were primitive vertebrate suspension feeders
D、primitive vertebrates with teeth appeared earlier than armored vertebrates
E、scientists’ original observations concerning the phosphatic remains of conodonts were essentially correct
答案:
D
提问：
麻烦英吉老师年后上班了帮讲下这篇文章的结构，大概读出了c这个东西很有争议，1981年的发现科学家重构了一下结构，有了关于它的vk的两种假说，一种认为它是主要出于防御机制进化出来的，一种出于它是攻击性演化出来的。但是很多细节都没读出来所以这题就只对了第二题问第二段有什么作用那题。谢谢英吉老师
解答：
点赞0
阅读1986
提问：
老师 我想听您梳理一下这篇文章的脉络 看一下我的理解是否正确 这道题我有定位到具体的句子 但没办法确定选项
解答：
点赞1
阅读1898
提问：
麻烦英吉老师年后上班了帮讲下这篇文章的结构，大概读出了c这个东西很有争议，1981年的发现科学家重构了一下结构，有了关于它的vk的两种假说，一种认为它是主要出于防御机制进化出来的，一种出于它是攻击性演化出来的。但是很多细节都没读出来所以这题就只对了第二题问第二段有什么作用那题。谢谢英吉老师
解答：
点赞0
阅读1987
问个问题
注册太麻烦？点这里查看免费答疑吧！
博币不足
加"GMAT小百科"小智微信
直接送200
