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
8
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] 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
文章的题目其实也就是对全文中心的归纳,整篇文章都在叙述有关能发电的特殊鱼类及其具体发电过程。A项“电鳗”当然不正确,全文说明的鱼类不只鳗鱼一类,且重点也不是鳗鱼而是其发电系统。B项电鳐也同样不正确,C项“发电的鱼”这显然与全文主题相切,D项“电力”这与全文巾题相切,D项“电力”这与全文中心差距太大,所以应选C项。
转载请注明原文地址:https://tihaiku.com/zcyy/3454676.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
Ifyouweretotape-recordoneofDavidLetterman’scomedyroutines,memoriz
某水冷离心式冷水机组,设计工况下的制冷量为500kW,COP为5.0,冷却水进出
在HTML中,表格边框的宽度由()属性指定。A.width B.heigh
重要的剧节目演出,一般要进行一两次甚至更多次的彩排演出,带妆彩排与正式演出一样,
我国上市公司的股利分配实践中,股利支付方式包括( )。A.财产股利 B.现
某商业银行目前的资本金为40亿元,信用风险加权资产为100亿元,根据《商业银行资
下列关于税务行政处罚的说法中,正确的是( )。A.税务机关对公民作出500元以上
下列不属于关税纳税义务人的是( )。A.进口货物的收货人 B.出口货物的发货
下列关于钢筋弯制的说法中,错误的是()。A.钢筋宜在常温状态下弯制,不宜加热
以下哪项是毕Ⅰ式胃大部切除术的优点?A.适用于各种情况的胃十二指肠溃疡 B.吻
最新回复
(
0
)