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
专升本
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
2011-04-26
61
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 (电鱼), of which several kinds live in warm seas. They posses on each side of the head, behind the eyes, a large organ consisting of a number of hexagon- al 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 centimeters 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.
The ideal title for this passage is ______. ( )
选项
A、The Eel
B、Torpedo
C、Electric Fish
D、Electric Power
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/DHqC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Accordingtothepassage,thecomingofonlinejobsearchingbrings______.ProfessorChallengerthinks______.shouldbeconsid
Thehardtruthisthat______Lucy,______hertwinsisterhaven’tyetdoneenoughtogetapassinggradeforthecourse.
Theyhavecooperatedsowellthattheydecideto______theiragreementforanotherfiveyears.
Lincolnwasastrongexecutivewhosavedthegovernment,savedtheUnitedStates.HewasaPresidentwhounderstoodpeople,and,
Ifyouplaywithelectricity,youmaygetanelectric______.
Muchdisorderwillappearifthe______(electric)issuddenlycutoff.
Atthattime,mostpeople______thenotion______thesunrevolvesaroundtheearth.
Theyworked______thecostoftheholidayanddecidediftheycouldaffordit.
Jackwishesthathe______nessinsteadofhistorywhenhewasatuniversity.
AfterManhasdreamedaboutflyingforalongtime.MichaelMoshierisadreamer.HeinventedtheSoloTrek.TheSoloTrekh
随机试题
与企业净利润计算无关的税金是()。
公文据以生效的关键性环节是审核。
维持人体体温,属于气的哪项功能
呈半球形的药材是呈菱状方形的药材是
【背景资料】某桥梁工程,承担该工程项目的施工单位项目经理部为达到安全文明施工,预防事故的发生,在施工前制订了施工现场安全生产保证计划。施工单位在施工过程中制订了安全措施:(1)模板安装完毕后,经签认后才可浇筑混凝土;(2)制作支架、木拱架时,主要压力杆的
一个组织要想建立良好的内部公共关系,首要的问题是()。
disastrousattacks
Wemaylookattheworldaroundus,butsomehowwemanagenottoseeituntilwhateverwe’vebecomeusedtosuddenlydisappears
A、 B、 C、 C根据“刮风”可知答案为C。
Michaelpromptly______whenhiswifesuggestedanextravaganttriptoSpainthissummer.
最新回复
(
0
)