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
外语
The modem age is an age of electricity. People are so used to electric lights, radios, televisions, and telephones that it is ba
The modem age is an age of electricity. People are so used to electric lights, radios, televisions, and telephones that it is ba
admin
2010-06-01
64
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.
The author mentions all of the following as results of a blackout EXCEPT ______.
选项
A、refrigerated food items may go bad
B、traffic lights do not work
C、people must rely on candlelight
D、elevators and escalators do not function
答案
D
解析
细节题,在第一段中提到了停电后所带来的种种不便,D未提到。
转载请注明原文地址:https://kaotiyun.com/show/moN7777K
0
大学英语四级
相关试题推荐
A、Hecannotmakeacopybecauseofthecopyright.B、Hecanmakehisowncopy.C、Heshouldwaituntiltomorrow.D、Hecannotmak
Wantaglimpseofthefutureofhealthcare?Takealookatthewaythevariousnetworksofpeopleinvolvedinpatientcareare
A、Hisfatherissick.B、Hedoesn’tlikeschool.C、Hecausesalotoftrouble.D、He’sapoorstudent.D
MedicareinAmericaWhenDrugPricesAreoutofReachTrueStory.ElderlyanduninsuredAmericanspaythehighestpric
MedicareinAmericaWhenDrugPricesAreoutofReachTrueStory.ElderlyanduninsuredAmericanspaythehighestpric
A、Helackstime.B、Helackswillpower.C、Helackssleep.D、Helacksmedicine.B
StoppingSmoking:ASH’s15Tips—ActiononSmokingandHealth1.GetProfessionalHelpRingthehelplineonFreephone0
Thecompanyshouldbebrokenupintotwoentities,onetodevelopoperatingsystem,______(另外一个促进)softwareapplications.
Smokingmeanssomethingdifferenttovariouscultures.In【B1】______,manypeoplesmoke.Inwinter,itisoftendifficultto【B2】_
A、Hisresumewasrefusedbymanycompanies.B、Hiswaswaitingfortheresultsofinterviews.C、Hehasreceivednoresponseofac
随机试题
骨折急救的目的是用简单而有效的方法,抢救生命,保护患肢,使伤者能够被安全迅速地运送至医院。骨折急救的原则是()。
若广义积分∫0+∞dx=1,其中k为常数,则k=()
A.《纽伦堡法典》B.《赫尔辛基宣言》C.《希波克拉底誓言》D.《大医精诚》E.《伤寒杂病论》反映孙思邈的医德思想和境界的是
缺铁性贫血的主要原因是
一患者上颌局部义齿修复。义齿初戴时,发现上腭后部弯制的腭杆离开腭黏膜2mm。处理方法是
上消化道大出血的常见原因除外
吗啡禁用于分娩止痛的原因是
产后6天,腹痛,发热39℃,恶露混浊有臭味,检查子宫复旧不佳,不压痛。乳房胀痛,该产妇最大可能是:
当设计无要求时,无组织排水的散水宽度可按檐口线放出()mm。
某钢厂生产螺丝钉。已知螺丝钉的质量服从正态分布,标准规定螺丝钉的质量为5克,标准差不超过0.1克。随机抽查20个螺丝钉,平均质量为=4.98克,样本的方差为s2=0.8l。检验均值采用()。
最新回复
(
0
)