首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The idea of a fish being able to generate electricity strong enough to light lamp bulbs--or even to run a small electric motor--
The idea of a fish being able to generate electricity strong enough to light lamp bulbs--or even to run a small electric motor--
admin
2013-03-11
66
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(电鳐), 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 flat 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 centime-tres 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(纵向) and are supplied with nerves from the spinal(脊骨) 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 (likely) to tire, so they are not able to produce electricity for very long.
The power of producing electricity may serve these fish both for defence and attack.
It can be seen from the passage that______.
选项
A、the capacity to generate electricity is the distinctive characteristic of the fish
B、the current travels in an upward direction from the positive side to negative side in torpedo’s electric cells
C、some fish can produce enough electricity to drive a number of electric motors
D、the torpedo’ s electric cells have a shape with six sides
答案
D
解析
这一题要求我们在对全文整体理解后,并一一对照文中细节,才能做出选择。A认为“产生电的能力是鱼类的一种有别于其他生物的特性”。事实上鱼类中只少数几种特殊的鱼有产生电的能力,并非所有的鱼类。因此A项是不正确的。
转载请注明原文地址:https://kaotiyun.com/show/ahr7777K
0
大学英语四级
相关试题推荐
Forthispart,youareallowed30minutestowriteacompositiononIncomeSoursesofCollegeStudentsbasedonthefollowingch
Whenshouldanyvacationsfromthinkingbetaken?Inthissection,youwillhearatimes.Whenthepassageisreadforthefirst
A、1/2.B、1/3.C、1/4.D、2/3.AHowmanycollegestudentsintheUnitedStatesworkwhiletheyarestudying?
ThispassageisareportonthegrowingnumberofAmericanswhoadoptchildrenfromothercountries.Thecomplexissuesinfami
Advancedtechnologyhaddirectly______(导致城市过分成长)。
You’rebusyfillingouttheapplicationformforapositionyoureallyneed.Let’sassumeyouonceactuallycompletedacoupleo
InformedpublicdebatecriticaltofutureofgenomicmedicineJustmentioning"stem-cellresearch"or"genomicmedicine"can
Ifyouwanttobuyahouse,whichofthefollowingcouldyoudo?Largebusinessesneedtoborrowhugeamountsofmoneybecause_
Soyou’renewonthejob,newtoyourcareer,newtotheworkplace.Whenyoulookatyourselfinanewmirror,areyouproudof
随机试题
为什么说意象的生产有双重的涵义?
企业的股权资本一般采用的筹资方式是()
下列选项中属于第二信号系统活动的是()
成人胸外心脏按压的正确位置是
甲电梯设备有限公司与乙房地产开发商签订了电梯买卖合同,甲电梯设备有限公司的主要义务包括()。
熔炼铸铁常用()。
我国第一只开放式基金是()。
邓小平指出:“改革是中国的第二次革命。”这句话是从()。
行政给付又称行政物质帮助,是指行政机关对公民在年老、疾病或丧失劳动能力等情况或其他特殊情况下,依照有关法律、法规、规章或政策等规定,赋予其一定的物质权益(如金钱或实物)或与物质有关的权益的具体行政行为。下列各项中,不属于行政给付的是()。
Whetherit’scurledupinthefetalposition,flatonthestomachorstretchedoutacrossthebed,thewaypeoplesleep【C1】_____
最新回复
(
0
)