首页
登录
职称英语
The modem age is an age of electricity. People are so used to electric light
The modem age is an age of electricity. People are so used to electric light
游客
2024-02-27
33
管理
问题
The modem age is an age of electricity. People are so used to electric lights, radios, televisions, and telephones that it is bard to imagine what life would be like without them. When there is a power failure, people grope (摸索) about in flickering candlelight, cars hesitate in the streets because there are no traffic lights to guide them, and food spoils in silent refrigerators.
Yet people began to understand how electricity works only a little more than two centuries ago. Nature has apparently been experimenting in this field for millions of years. Scientists are discovering more and more that the living world may hold many interesting secrets of electricity that could benefit humanity.
All living cells sent out tiny pulses of electricity. As the heart beats, it sends out pulses that can be measured and recorded on the surface of the body. When the pulses are recorded, they form an electrocardiogram(心电图), which a doctor can study to determine how well the heart is working. The brain, too, sends out brain waves of electricity, which can be recorded in an electroencephalogram, The electric currents generated by most living cells are extremely small--of- ten so small that sensitive instruments are needed to record them. But in some animals, certain muscled cells have become so specialized as electrical generators that they do not work as muscle cells at all. When large numbers of these cells are linked together, the effect can be astonishing.
The electric eel is an amazing living storage battery. It can send a jolt of as much as eight hundred volts of electricity through the water in which it lives. ( An electric house current is only one hundred twenty volts. ) As many as four-fifths of all the cells in the electric eel’s body are specialized for generating electricity, and the strength of the shock it can deliver corresponds roughly to the length of its body. [br] Why does the author mention electric eels?
选项
A、To warn the reader to stay away from them.
B、To compare their voltage to that used in houses.
C、To give an example of a living electrical generator.
D、To describe a new source of electrical power.
答案
C
解析
文中最后一段提到As many as four-fifths of all the cells in the electric eel’s body are specialized for generating electricity。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3486147.html
相关试题推荐
[originaltext]Ifyouarelikemostpeople,yourintelligencevariesfromse
[originaltext]Ifyouarelikemostpeople,yourintelligencevariesfromse
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
[originaltext]Peoplemanagementskillsarethemostimportantskillsamana
[originaltext]M:Whodoyouthinkwillmakebetterservicepeople?W:Shouldbe
[originaltext]M:Whodoyouthinkwillmakebetterservicepeople?W:Shouldbe
随机试题
______wasanactorbeforehebecametheUSPresident.A、RonaldReaganB、Abraham
[originaltext]W:Howwillyoulikecollege,Simon?M:IdoubtifI’lllikewher
进行土方明挖时,监理机构应对开挖过程进行( )监督检查,对开挖质量进行控制。A.
职业道德的规范功能表现在()。A.通过教育引导,帮助从业人员树立崇高的职业理想
A.系统脱敏法 B.厌恶疗法 C.行为塑造法 D.代币制疗法 E.暴露疗
关于轻型井点降水施工的说法,正确的有()。A:轻型井点一般可采用单排或双排布置
运动中,由于肌肉突然猛烈收缩,最容易引起的损伤是()。A.肌肉痉挛 B.关
1949~1978年我国在计划经济条件下,居住区按照街坊、小区等模式统一规划、统
下列没有歧义的一句是( )。A.这个发言稿是新来的市长的秘书写的 B.他在树
A.A+B+C B. C.ABC D.1
最新回复
(
0
)