首页
登录
职称英语
The idea of a fish being able to generate electricity strong enough to light
The idea of a fish being able to generate electricity strong enough to light
游客
2024-08-07
39
管理
问题
The idea of a fish being able to generate electricity strong enough to light lamp bulbs--or even to run a small electric motor--is almost unbelievable, but several kinds of fish are able to do this. Even more strangely, this curious power has been acquired in different ways by fish belonging to very different families.
Perhaps the best known are the electric rays, or torpedoes, of which several kinds live in warm seas. They possess on each side of the head, behind the eyes, a large organ consisting of a number of hexagonal shaped cells rather like a honeycomb. The cells are filled with a jelly-like substance, and contain a series of fiat electric plates. One side, the negative side, of each plate, is supplied with very fine nerves, connected with a main nerve coming from a special part of the brain. Current passes from the upper, positive side of the organ downwards to the negative, lower side. Generally it is necessary to touch the fish in two places, completing the circuit, in order to receive a shock.
The strength of this shock depends on the size of the fish, but newly born ones only about 5 centimetres across can be made to light the bulb of a pocket flashlight for a few moments, while a fully grown torpedo gives a shock capable of knocking a man down, and, if suitable wires are connected, will operate a small electric motor for several minutes.
Another famous example is the electric eel. This fish gives an even more powerful shock. The system is different from that of the torpedo in that the electric plates run longitudinally and are supplied with nerves from the spinal cord. Consequently, the current passes along the fish from head to tail. The electric organs of these fish are really altered muscles and like all muscles are apt to tire, so they are not able to produce electricity for very long.
The electric catfish of the Nile and of other African fresh waters has a different system again, by which current passes over the whole body from the tail to the head. The shock given by this arrangement is not so strong as the other two, but is none the less unpleasant. The electric catfish is a slow, lazy fish, fond of gloomy places and grows to about 1 metre long; it is eaten by the Arabs in some areas.
The power of producing electricity may serve these fish both for defence and attack. If a large enemy attacks, the shock will drive it away; but it appears that the catfish and the electric eel use their current most often against smaller fish, stunning them so that they can easily be overpowered.
For answers 51-55, mark
Y(for YES) if the statement agrees with the information given in the passage;
N (for NO) if the statement contradicts the information, given in the passage;
NG(for NOT GIVEN) if the information is not given in the passage. [br] The electric plates on the electric eel are supplied with nerves from its brain.
选项
A、Y
B、N
C、NG
答案
B
解析
由第四段可知The electric plates on the electric eel are supplied with nerves from the spinal cord而不是its brain。
转载请注明原文地址:https://tihaiku.com/zcyy/3710035.html
相关试题推荐
Theideaofafishbeingabletogenerateelectricitystrongenoughtolight
Theideaofafishbeingabletogenerateelectricitystrongenoughtolight
Theideaofafishbeingabletogenerateelectricitystrongenoughtolight
Theideaofafishbeingabletogenerateelectricitystrongenoughtolight
Theideaofafishbeingabletogenerateelectricitystrongenoughtolight
______enoughtimeandmoney,theresearcherswouldhavebeenabletodiscovermo
Accordingtothesurveydoneamongthelocalresidents,______enoughmoney,the
Itissimpleenoughtosaythatsincebookshaveclasses—fiction,biography,poe
______enoughtimeandmoney,theresearcherswouldhavebeenabletodiscovermo
______enoughtimeandmoney,theresearcherswouldhavebeenabletodiscovermo
随机试题
[originaltext]Acommonchallengeformanyteachersiskeepingtheirstudents
ThelatestNationalReportonHigherEducationsaysthat______.[br][originalt
【教学过程】 环节一:导入新课 教师播放两个视频片段,一个是《鸦片战争》的片段,一个是《甲午战争》的片段,请同学比较两次战争中清军所使用的武器发生了什么
被审计单位银行存款日记账余额与银行对账单余额不一致时,审计人员应采取的措施有:A
根据下列资料回答问题。 以下说法正确的是()。A.2009年该省社会消
人生观的作用主要通过人生目的、人生态度、人生价值三个方面体现出来,其中居于核心地
农村资金互助社的资金不得用于()。A.发放非社员单位贷款 B.存放于其他金融机
教学工作的基本程序包括()。 A.上课 B.课外辅导 C.学业成绩的检查与
男,50岁。劳累时胸痛2年,每于上3层楼梯时症状发作,含服硝酸甘油1~3分钟可缓
毛细血管壁增厚呈车轨状或分层状见于A、弥漫性系膜增生性肾小球肾炎 B、弥漫性新
最新回复
(
0
)