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
专升本
The modern age is an age of electricity. People are so used to electric lights, radios, televisions, and telephones that it is h
The modern age is an age of electricity. People are so used to electric lights, radios, televisions, and telephones that it is h
admin
2011-04-26
84
问题
The modern age is an age of electricity. People are so used to electric lights, radios, televisions, and telephones that it is hard to imagine what life would be like without them. When there is a power failure, people grope about in fickering 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 off pulses of electricity that can be measured and recorded at the surface of the body. When the pulses are recorded, they form an electrocardiogram, 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 -- often so small that sensitive instruments are needed to record them. But in some animals, certain muscle 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.
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
本题为事实题。根据文章最后一段第二句“It can send a jolt of as much as eight hundred volts of electricity through the water in which it lives”可知,B为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/PVqC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Schoolshavebecomelessimportantandlong-termhealthcaremoreimportantasAmericabecomesasocietywithfewerchildrenand
RonaldMusokeisastudentat______inCalifornia.BookswerepreciousinUgandabecausetheschools______.
WhatwasE.B.White?Whatwastheauthor’spurposeforwritingchildren’sbooks?
Colorandsexarenotrelevant______whetherapersonissuitableforthejob.
Thisstorymentionscollegegraduatesat_______.Whichofthefollowingmajorshasthebestjobprospects,accordingtothest
Duringvoting,thecity______willwinhostofOlympics.Inselectingthehostcity,theIOCwillconsiderseveralfactorsexc
Itisreportedthat______(identify)flyingobjectswereseenoverNewJerseylastnight.
Thesingergavean______(accept)performance,butitwasnotoutstanding.
The______behaviourofthesupportersofthefootballteamscausedthepolicesurroundthefootballgroundduringthematch.
Hewillbesentto(一样收取高学费的学校)hisfatherattended.
随机试题
治疗因肾虚所致经行泄泻的最佳方剂是
A.疝内容物易回纳入腹腔B.疝内容物不能完全回纳入腹腔C.疝内容物有动脉性血循环障碍D.疝内容物被疝环卡住不能还纳,但无动脉性循环障碍E.疝内容为部分肠壁难复性疝为
按成槽方式对地下连续墙进行分类,不包括( )。
因海关关员的责任造成被查验货物损坏的,进出口货物收发货人或其代理人可以要求海关赔偿。但海关将不予赔偿的情况是:()。
下列不属于我国各级财政部门的预算职权的是()。
(2017年改)某企业为增值税一般纳税人,适用的增值税税率为13%。2019年12月1日,该企业“原材料——甲材料”科目期初结存数量为2000千克,单位成本为15元,未计提存货跌价准备。12月份发生有关甲材料收发业务或事项如下:(1)10日,购入甲材料
2018年9月11日,国家主席习近平在符拉迪沃斯托克和俄罗斯总统普京共同出席中俄地方领导人对话会。习近平主席就未来两国地方合作提出多点建议,主要包括()。①发挥国家引领作用.加强统筹协调②创新合作思路,拓展合作地域③深挖互补优势,突出地方特色
管弦乐《台湾舞曲》是我国作曲家聂耳的代表作。
A.Iwanttocheckin.B.Youmayboardnow.C.I’mafraidyourbagisfourkilosoverweight,A:IsthistherightcounterforCA
SuggestopediaI.IntroductionA.DerivedfromsuggestionandpedagogyB.Acceleratingthelearningspeedtoabout【T1】ofthecon
最新回复
(
0
)