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—is
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
admin
2014-04-23
70
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 (鳐鱼),or torpedoes (水雷鱼),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 cells which 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.
Another famous example is the electric eel (鳗鱼).This fish gives an even more powerful shock. The system is different from that of the torpedo in that the electric plates run along the length of its body and are supplied with nerves from the spinal cord (脊髓). 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, they tend to tire easily, so they are not able to produce electricity for very long.
The power of producing electricity may serve these fish both for defense and attack. If a large enemy attacks, the shock will drive it away; but it appears that the electric eel uses its current most often against smaller fish.
The purpose of the shock produced by electric fish is to______.
选项
A、protect themselves from being attacked
B、light up nearby waters
C、attack other fish or marine animals
D、both A and C
答案
D
解析
本题问能放电的鱼放电的目的是什么。根据文章的最后一段内容,这一放电的功能使它们具有攻击和自卫能力。如果遇到庞大的敌人的攻击,放电电流会把敌人赶跑。但是,似乎电鳗在更多的情况下是用其电流攻击较小的鱼类。由此,我们可以推断出本题的正确答案应是D“保护自己不受攻击和攻击其他鱼类和海洋生物”。
转载请注明原文地址:https://kaotiyun.com/show/21WO777K
0
在职攻硕英语联考
相关试题推荐
Opinionpollsarenowbeginningtoshowthatwhoeveristoblameandwhateverhappensfromnowon,highunemploymentisprobably
Foranyonewhohasexperiencedanearthquake,theexperiencecanbefrighteningandtraumatic.Inadditionofthemovementofth
PresidentCoolidge’sstatement,“ThebusinessofAmericaisbusiness,”stillpointstoanimportanttruthtodaythatbusinessin
Justoveradecadeintothe21stcentury,women’sprogresscanbecelebratedacrossarangeoffields.Theyholdthehighestpol
TheMITSloanSchoolofManagementstronglybelievesthatitspurposeistogivestudentsthetoolstheywillneedtobeeffecti
ThereisnogreaterpowerintheworldtodaythanthatwieldedbythemanipulatorsofpublicopinioninAmerica.【T1】Nokingor
Isitpossibletobebothfatandfit--notjustfitenoughtoexercise,butfitenoughtoliveaslongassomeonealotlighter?
Wewouldn’thaveimaginedit?Afteryearsontop,Nikesuddenlylookslikeaworld-classmarathonerwho,inmid-race,questions
Animalsaremorelikeusthanweeverimagined.Theyfeelpain,theyexperiencestress,andtheyshowaffection,excitementand
A、JohnFitzgeraldKennedy.B、JacquelineKennedy.C、DwightEisenhower.D、EdwardDurrellStone.C文中说:建造肯尼迪表演艺术中心的想法始于1958年,艾森豪威尔总统
随机试题
下列哪组药物既能发散风热,又能透疹
甲在强制戒毒所戒毒时,无法抗拒毒瘾,设法逃出戒毒所。甲径直到毒贩陈某家,以赊账方式买了少量毒品过瘾。后甲逃往乡下,告知朋友乙详情,请乙收留。乙让甲住下(事实一)。甲对陈某的毒品动起了歪脑筋,探知陈某将毒品藏在厨房灶膛内。某夜,甲先用毒包子毒死陈某的2条看门
办理权证代理结算须向中国结算深圳分公司提交的材料中,不包括()
原始凭证按照()的不同分为一次凭证、累计凭证和汇总凭证。
学校物质文化有两种表达方式:______,______。
在提供同等能源量的前提下,二氧化碳排放量高的是()。
一项全球范围的调查显示,近10年来,吸烟者的总数基本保持不变;每年只有10%的吸烟者改变自己的品牌,即放弃原有的品牌而改吸其他品牌;烟草制造商用在广告上的支出占其毛收入的10%。在Z烟草公司的年终董事会上,董事A认为,上述统计表明,烟草业在广告上的收益正好
中国革命由旧民主主义革命向新民主主义革命转变的条件有
AGiventhealreadydocumentedincidenceofabuseandviolenceBinadolescent’slives,theavoidanceoftheseissuesreinforcest
A、HeandhisfriendshaveneverwornAdidas.B、AdidasisjustforgreatsportsplayersliketheChicagoBulls.C、Adidashelpssp
最新回复
(
0
)