首页
登录
职称英语
The idea of a fish being able to generate electricity strong enough to light
The idea of a fish being able to generate electricity strong enough to light
游客
2024-02-16
45
管理
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. [br] 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://tihaiku.com/zcyy/3454673.html
相关试题推荐
[originaltext]EnglandbecameastrongholdoftheProtestantversionofChri
[originaltext]EnglandbecameastrongholdoftheProtestantversionofChri
[originaltext]EnglandbecameastrongholdoftheProtestantversionofChri
LanceArmstrongisthirty-threeyearsoldandisoneofthebestathletesin
LanceArmstrongisthirty-threeyearsoldandisoneofthebestathletesin
LanceArmstrongisthirty-threeyearsoldandisoneofthebestathletesin
LanceArmstrongisthirty-threeyearsoldandisoneofthebestathletesin
He______(本来可以选择另一种职业),butatthetime,hedidn’thaveenoughmoney.mighthave
Strongemotionsareusually【B1】______nonverbally:Bygestures,bodyposture,
Strongemotionsareusually【B1】______nonverbally:Bygestures,bodyposture,
随机试题
Hisoriginalityasacomposeris______bythefollowinggroupofsongs.A、exemplif
我喜欢两句诗:“山僧不解数甲子,一叶落知天下秋。”山上的和尚不知道如何计算里子,只观察自然,看到一片叶子落下,就知道已是秋天了。现代都市人正好相反,可以说是“落
我国将于2005年停产卤代烷1211灭火剂,2010年停产卤代烷1301灭火剂,
(2018年)管理人不能依法、公正执行职务或者有其他不能胜任职务情形的,有关主体
水泥28d强度应从水泥加水拌和开始算起,试件在28d±()内必须进行强度试
根据《发布证券研究报告执业规范》,证券公司、证券投资咨询机构及证券分析师应履行的
易于导致咳嗽少痰,或痰粘难咳,或喘息胸痛等症状的邪气是A.风邪 B.寒邪
下列各项中,属于法律关系主体的是( )。[2011年中级真题]A.法人 B.
在方位知觉的发展中,儿童在( )岁能够正确判别前后。A.3 B.4 C.5
巨额赎回风险不是()所特有的风险。A:成长型基金B:封闭式基金C:开放式基金
最新回复
(
0
)