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
In April 1995, a young Chinese chemistry student at Beijing University lay dying in a Beijing hospital. She was in a coma, and a
In April 1995, a young Chinese chemistry student at Beijing University lay dying in a Beijing hospital. She was in a coma, and a
admin
2011-01-02
45
问题
In April 1995, a young Chinese chemistry student at Beijing University lay dying in a Beijing hospital. She was in a coma, and although her doctors had performed numerous tests, they could not discover what was killing her. In desperation, a student friend posted an SOS describing her symptoms to several medical bulletin boards and mailing lists on the Intermet. Around the world, doctors who regularly checked these electronic bulletin boards and lists responded immediately.
In Washington D. C., Do, John Aldis, a physician with the U.S. Department of State, saw the message from China. Using the Internet, he forwarded the message to colleagues in America. Soon an international group of doctors joined the e-mail discussion. A diagnosis emerged -- the woman might have been poisoned with thallium, a metal resembling lead. A Beijing laboratory confirmed this diagnosis -- the thallium concentration in her body was as much as 1,000 times normal. More e-mail communication followed, as treatment was suggested and then adjusted. The woman slowly began to recover. Well over a year later, the international medical community was still keeping tabs on her condition through the electronic medium that saved her life.
It’s 11: 30 p. m., you’re in San Francisco on business, and you want to check for messages at your office in Virginia. First you dial in and get your voice mail. Next you plug your portable computer into the hotel-room telephone jack, hit a few keys, and pick up e-mail from a potential client in South Africa, your sister in London, and a business associate in Detroit. Before writing your response, you do a quick bit of search on the Internet, tracking down the name of the online news group you had mentioned to the roan in Detroit and the title of a book you wanted to recommend to your sister. A few more keystrokes and in moments your electronic letters have reached London and Detroit. Then, knowing that the time difference means the next workday has begun in South Africa, you call there without a second thought.
These stories reflect society’s increasing reliance on system of global communication that can link you equally easily with someone in the next town or halfway around the world. The expanded telephone-line capacity that has allowed the growth of these forms of communication is a recent phenomenon. The United States has enjoyed domestic telephone service for more than a century, but overseas telephone calls were difficult until relatively recently. For a number of years after World War Ⅱ, calls to Europe or Asia relied on short-wave radio signals. It sometimes took an operator hours to set up a 3-minute call, and if you got through, the connection was often noisy.
In 1956, the first transatlantic copper wire cable allowed simultaneous transmission of 36 telephone conversations -- a cause for celebration then, a small number today. Other cables followed; by the early 1960s, overseas telephone calls had reached 5 million per year. Then came satellite communication in the middle 1960s, and by 1980, the telephone system carried some 200 million overseas calls per year. But as demands on the telecommunication system continued to increase, the limitations of current technology became apparent. Then, in 1988, the first transatlantic fiberoptic cable was laid, and the "information superhighway" was on its way to becoming reality.
Optical fibers form the backbone of the global telecommunication system stronger, length for length, than steel -- were designed to carry the vast amounts of data that can be transmitted via a relatively new form of light-tightly focused laser. Together, lasers and optical fibers have dramatically increased the capacity of the international telephone system. A typical fiber-optic cable made up of 100 or more such fibers can carry more than 40,000 voice channels. With equally striking improvements in computing, the new communication technology has fueled the exponential growth of the phenomenon known as the Internet.
The information superhighway came into existence because of ______.
选项
A、copper wire cables
B、satellite communication
C、optical fibers
D、laser and optical fibers
答案
D
解析
该题问:信息高速公路成为现实是因为什么?A项意为“铜丝电缆”,这在文中提到是在第五段In 1956, the first transatlantic Copper Wire cable allowed simultaneous transmission of 36 telephone conversations — a cause for celebration then, a small number today,那时信息高速公路还未存在,因此A项不正确。B项意为“卫星通讯”,这在文中提到也是在第五段Then came satellite communication in the middle l960s,那个时候信息高速公路也未存在。C项意为“视觉纤维”,这在文中提到也是在第五段Then in 1988,the first transatlantic fiber-optic cable was laid, and the "information superhighway" was on its way to becoming reality, 此句写的时间是on its way,所以C项也不正确。D项意为“激光与视觉纤维”,这在本文中的最后一段的第一句提到,因此D项为正确选项。
转载请注明原文地址:https://kaotiyun.com/show/h1eO777K
0
专业英语八级
相关试题推荐
1 OurheritageandourculturehavecausedmostAmericanstoassumenotonlythatourlanguageisuniversalbutthatthegestur
DreamFunctions Dreamingisacommonphenomenon.Practicallyallpeopledream,althoughwhethertheycan【1】________themisa
1 Someconsumerresearchersdistinguishbetweenso-calledrationalmotivesandemotional(ornon-rational)motives.Inamarket
WhenaScottishresearchteamstartledtheworldbyrevealing3monthsagothatithadclonedanadultsheep,PresidentClinton
IfitwereonlynecessarytodecidewhethertoteachelementarySciencetoeveryoneonamassbasisorfindthegiftedfewandt
InformationSuperhighwayatWorkThechangesinhowwecommunicatemakeitnecessarytochangehowwethinkaboutcommunicati
谁知就在他准备启程前往美国之前,他遭到一个突然的打击。她用从未用过的语气给他写了一封信。信中她以一种简略的、办理事务式的态度通知他,说自己的财产正处于全面崩溃的边缘,因而从此以后她无法再供给他任何款项了,她还告诉他,他们之间的亲密关系必须结束了……
文学的工具是语言文字。首先我们必须认识语言文字,其次必须有运用语言文字的技巧。这事看起来似乎很容易,因为一般人日常都在运用语言文字。但是实在很难的,因为文学要用平常的语言文字产生不平常的效果。文学家对于语言文字的了解,必须比一般人都更精确、更透彻,然后方可
C英国文学之作家作品。DonJuan,中文名为《唐璜》,是英国浪漫主义诗歌代表人拜伦所写的长诗。
C英国文学之作家概况。JohnKeats(1795—1821),第二代浪漫主义诗人代表,代表作为OdetoaNightingale(《夜莺颂》),写作风格推崇“Beautyistruth,truthbeauty’’。
随机试题
结核病:血吸虫病:
1:5000地形图的比例尺精度是()。
某机电安装公司承包了北方干旱地区某厂的一项机电项目的技术改造工程,合同工期120天。工程内容包括:(1)新建设备(机械、容器)安装和2台1000m3常压钢制储槽现场制作、安装以及管道系统改造安装;(2)2台500m3旧钢制储槽和一座旧砖混结构操作间的拆除,
案例四[背景材料]某工程项目的施工招标文件中表明该工程采用综合单价计价方式,工期为15个月。承包单位投标所报工期为13个月。合同总价确定为8000万元。合同约定:实际完成工程量超过估计工程量25%以上时允许调整单价;拖延工期每天赔偿金为合同
某运输企业位于市区。系增值税一般纳税人,2013年10月发生如下业务:(1)为某企业运输一批原材料,取得货运收入20万元,另外向对方收取包装费2.2万元,给对方开具增值税普通发票。(2)与甲运输企业共同承接一项联运业务,收取全程不含税货运收入75万元.
质押贷款业务的主要风险因素可能包括()。[2015年10月真题]
甲公司是一家上市公司,截至2013年底,甲公司注册资本为8000万元,经审计的净资产额为12000万元。甲公司董事会由11名董事组成,其中董事A、董事B和董事C同时为控股股东乙公司董事;董事D同时为丙公司董事;董事E同时为丁公司董事。2014年1月20日甲
圆(x-1)2+y2=1的圆心到直线z+y-2=0的距离是().
下列关于违规制造、销售枪支罪的说法错误的是()。
如果在VisualBasic集成环境中没有打开属性窗口,下列可以打开属性窗口的操作是( )。
最新回复
(
0
)