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
2023-07-26
34
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] How many volts of electricity can an electric eel emit?
选项
A、1,000.
B、800.
C、200.
D、120.
答案
B
解析
可以从全文最后一句话中得出正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/2869884.html
相关试题推荐
[originaltext]Ifyouarelikemostpeople,yourintelligencevariesfromse
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
SomepeoplelikewatchingTVathome,andothersmaylovehiking.ButIlike
[originaltext]M:Whodoyouthinkwillmakebetterservicepeople?W:Shouldbe
[originaltext]M:Whodoyouthinkwillmakebetterservicepeople?W:Shouldbe
随机试题
Whatdoesthepassagemainlydiscuss?[br]Accordingtothepassage,whyisth
过去十年中国房地产(realestate)行业高速发展。Thepastdecadehaswitnessedahigh-speeddevelopm
《水利水电工程标准施工招标条件》(2009)的通用条件规定,工程变更按下列原则确
(2016年)2019年5月,李某从某汽车4s店(一般纳税人)购入一辆排气量为2
某医师在为患者施行右侧乳房肿瘤摘除术时,发现左侧乳房也有肿瘤,当即进行活检,确诊
一笔8年期的公司贷款,商业银行允许展期的最长期限是()年。A.1 B.8
病人如果出现阿-斯综合征,最可能的诊断是A.室上性心动过速 B.室性心动过速
对类风湿性关节炎具有较高诊断价值的检测项目为A:RFB:CRPC:ANAD
在进行建设项目的环境影响评价时,正确的工作程序是:A.工程分析和环境质量现状调
为了做到法律协助执行与保护客户隐私并重,在实践工作中,从业人员应该做到()。
最新回复
(
0
)