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
29
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] It can be inferred from the passage that the longer an eel is the ______.
选项
A、more beneficial it will be to science
B、more powerful will be its electrical charge
C、easier it will be to find
D、tougher it will be to eat
答案
B
解析
细节题,最后一段中可找到答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3486149.html
相关试题推荐
Itisnaturalforyoungpeopletobecriticaloftheirparentsattimesand
Itisnaturalforyoungpeopletobecriticaloftheirparentsattimesand
[originaltext]Atthismomentsome170,000youngpeoplethroughoutBritain
[originaltext]Atthismomentsome170,000youngpeoplethroughoutBritain
Americansusuallyconsiderthemselvesafriendlypeople.Theirfriendships,
Americansusuallyconsiderthemselvesafriendlypeople.Theirfriendships,
Americansusuallyconsiderthemselvesafriendlypeople.Theirfriendships,
Americansusuallyconsiderthemselvesafriendlypeople.Theirfriendships,
Americansusuallyconsiderthemselvesafriendlypeople.Theirfriendships,
Americansusuallyconsiderthemselvesafriendlypeople.Theirfriendships,
随机试题
关于追加投资额的说法,下列正确的是()。A、持仓头寸获利后立即平仓,不再追加投资B、持仓头寸获利后追加的投资额应等于上次的投资额C、持仓头寸获利后追
Britishairisfarcleanerthanitwasafewdecadesago.Fewerpeopleusec
对于承重墙梁其最大跨度允许值为( )。A.6m B.12m C.9m D
商标注册的原则有( )。A.自愿注册与强制注册相结合的原则 B.商标标志合
根据我国现行规定,关于预备费的说法中,正确的是( )。 A、基本预备费以工程
2~3岁小儿,正常心率是()。A.120~140次/分 B.110~130次
1999年版FIDIC标准合同族的新黄皮书是指()。A、《施工合同条件》B、
用药错误的主要类型包括A.转抄错误 B.调剂错误 C.给药错误 D.监测错
在下列青春期龈炎的临床特征中,不正确的是A:好发于前牙唇侧 B:临床上与药物性
男性,45岁,酗酒后8小时出现中上腹疼痛,放射至两侧腰部,伴恶心、呕吐。体检:腹
最新回复
(
0
)