PTE听力练习题44-老托93-fish navigation

PTE考生目前最大的问题之一就是练习题缺乏。除了有限的基本官方书(PLUS,Testbuilder, OG)之外就没有题了。很多英语基础不是很扎实的同学很难找到练习材料。墨尔本文波雅思PTE培训学校专门为墨尔本,悉尼PTE考生准备了PTE练习的lecture 93篇。各位PTE同学可以练习阅读,练习记笔记技巧,可以练习复述,甚至可以练习describe image。废话少说,下面开始:


This room is devoted to electric fish. The eel in the tank behind me can produce a strong jolt of electricity to stun its prey, but most of the fish in here produce only weak electrical impulses that are useful for navigating, locating food, and even for communicating. The knife fish is a good example. This fish navigates, using tiny receptors in the skin that are sensitive to electrical impulses. The knife fish produces an electrical signal, and the receptors in its skin let it know when the signal is distorted by a tree root, or some other obstacle, so it can go around it. Fish also use the ability to produce and detect electrical impulses to communicate. They can tell each other what species they belong to, how big they are, and whether they’re male or female. We have a tank here that’s specially equipped to convert the inaudible signals the fish produce into sounds you can hear when you put on these headphones. I urge you all to listen in when I’m done speaking. Now have a look at the electric rays. Rays are especially interesting to medical researchers because of the organs they use to produce electricity. These organs contain a chemical that carries signals from one nerve ending to the next, not only in rays, but also in people. By studying these organs, scientists hope to learn more about diseases that interrupt the transmission of impulses from one nerve to another.
【生词摘录】
1. devote: v. 作„„标点符号
2. eel: n. [C]鳗(任一种长的蛇形的无鳞海洋或淡水鱼)
3. tank: n. [C]桶,箱,罐,槽,池塘
4. jolt: n. [C]重击
5. stun: v. 使晕倒,打晕
6. prey: n. 猎物
7. receptor: n. [C]接受器,感受器
8. distort: v. 歪曲,误传
9. obstacle: n. 障碍
10. species: n.[C]种类
11. inaudible: adj. 听不见的
12. headphone: n. [C]听音器,耳机
13. ray: n. [C]光线,放射线
14. nerve: n. [C]神经
15. ending: n. [C]末梢
16. transmission: n. [C]传输
17. impulse: n. [C]脉冲

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