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
72
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.
Usually you will not get a shock by touching the electric ray in one place only because______.
选项
A、the current in one place is not strong enough to give a shock
B、the fish’ s electric cells are filled with jelly-like substance
C、to complete the circuit, you have to touch the fish in two places
D、a torpedo’ s electric cells contain more than one electric plates
答案
C
解析
这一题主要是对细节部分的考查。第二段巾的最后一句话详细地写道,“通常需触摸鱼的两边从而使电路循环完成,这样才会感受到电击。”从这里的completing the circuit (完成循环),我们不难看出 C项是正确的。
转载请注明原文地址:https://kaotiyun.com/show/ihr7777K
0
大学英语四级
相关试题推荐
Timeandhowweexperienceithavepuzzledphysicistswhohavecreatedfascinatingtheories.Buttheirtimeismeasuredbyapen
Thetouristindustryhasplayedapositiverolein____________(满足公众的文化需求),carryingforwardnationalcultureandachievingthes
A、Childrendon’tgetenougheducationsafety.B、Childrenarekeenondangerousgames.C、Theplaygroundsareinpoorcondition.D
Whichofthefollowingwordsbestdescribesthetoneofthearticle?Whydidn’tLeeC.Bollingerpresentsomethingmoreaboutt
NaturalgasVehiclesKermittheFrogoncesaid,"It’snotthateasybeinggreen."Althoughhewasn’treferringtocars,hiso
NaturalgasVehiclesKermittheFrogoncesaid,"It’snotthateasybeinggreen."Althoughhewasn’treferringtocars,hiso
LanceArmstrongisthirty-threeyearsoldandisoneofthebestathletesintheworld.Scientistssayhisbodyoperatesbetter
You’rebusyfillingouttheapplicationformforapositionyoureallyneed.Let’sassumeyouonceactuallycompletedacoupleo
Ifyouwanttobuyahouse,whichofthefollowingcouldyoudo?Accordingtothepassage,whichofthefollowingisTRUE?
随机试题
下面五个选项中,说法正确的有()。
A.翳风、听会、侠溪、中渚B.外关、合谷、丘墟、太冲C.肾俞、气海、关元D.太溪、听宫、照海
李先生自感全身不适前来就诊。门诊护士巡视时发现他面色苍白,出冷汗,呼吸急促,主诉腹痛剧烈。急诊医生处理后,李先生留住急诊观察室。在评估患者时,下述哪项是客观资料
职位分析需要收集和整理的信息有()。
教育措施
[*]
下列推理正确的是
TheDepartmentofHomelandSecurityhasfilledthenation’stopcyber-securitypostafterthepreviouschiefabruptlyresignedl
A、Lindamadeherownguitar.B、Lindataughtherselftoplaythepiano.C、Lindataughtherselftoplaytheguitar.D、Lindadoesn’
A、Engineeringproblems.B、Theairpollutionitproduced.C、Inadequatefunding.D、Theoppositionfromthemilitary.C浏览四个选项,从选项中的
最新回复
(
0
)