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
86
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
Don’tcallhimjustacollegeprofessor.Internetentrepreneur,TVpersonality,advisortopresidents,andfriendtotherichan
ThecreationofUNwas,perhaps,themost______achievementofthe20thcentury.
TheMITSloanSchoolofManagementstronglybelievesthatitspurposeistogivestudentsthetoolstheywillneedtobeeffecti
ThereisnogreaterpowerintheworldtodaythanthatwieldedbythemanipulatorsofpublicopinioninAmerica.【T1】Nokingor
Wheneverweareinvolvedinacreativetypeofactivitythatisself-rewarding,afeelingovercomesus—afeelingthatwecanc
MykidstellmethatIam"so20thcentury",whichtroublesme.Apersonlikestofeelthatheis"withit",asweusedtosayi
Wehavecometorealizetheneedtoleaveenoughenvironmentalspaceforouroffspring.
Animalsaremorelikeusthanweeverimagined.Theyfeelpain,theyexperiencestress,andtheyshowaffection,excitementand
Animalsaremorelikeusthanweeverimagined.Theyfeelpain,theyexperiencestress,andtheyshowaffection,excitementand
Whenimaginativementurntheireyestowardsspaceandwonderwhetherlifeexistsinanypartofit,theymaycheerthemselvesb
随机试题
胃溃疡好发于哪个部位的溃疡
49岁女性,绝经2年后出现接触性出血。妇检见宫颈中度糜烂,多点活检病理检查为重度不典型增生。对该病人最恰当的处理是
胃溃疡的X线直接征象是
女性,10岁,扁桃体切除术后局部有少量出血,为配合止血可在颌下
某4跨简支梁桥,每跨上部结构由4片预应力T梁组成,请根据JTG/TH21—2011进行该桥的技术状况评定。经对结构构件检查,发现其中12片梁出现少量纵向裂缝,裂缝宽度未超限值,评定标度为2(最高标度为5);一处横隔板(全桥共20道横隔板)局部存在网状裂缝,
下列关于“4E”中第二个“E”考试(Examination)叙述错误的是( )。
根据《巴塞尔新资本协议》的定义判断,以下哪种情况发生时,债务人可被视为违约()
某企业长期持有A股票,目前每股现金股利2元,每股市价20元,在保持目前的经营效率和财务政策不变,且不从外部进行股权融资的情况下,其预计收入增长率为10%,则该股票的股利增长率为()。
国家公务员触犯刑法,免于刑事处罚的,视违纪情节,给予撤职或开除处分。()
Inthedaysbeforepreschoolacademieswereallbutmandatoryforkidsunder5,IstayedhomeandgotmyearlyeducationfromMi
最新回复
(
0
)