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
考研
Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK
Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK
admin
2023-02-24
19
问题
Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK scientists reporting transmission speeds of lOGbitfe—more than 250 times faster than ’superfast’ broadband. The fastest speed【C1】________reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】________a 150Mbp/s connection, but some experts were doubtful without seeing further【C3】________.
The term Li-Fi was【C4】________by Edinburgh University’s Prof Harald Haas【C5】________the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】________ its reduced costs and greater efficiency compared to traditional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【C7】________ the electromagnetic spectrum, but【C8】________Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】________ advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data【C10】________Li-Fi signals work by【C11】________bulbs on and off【C12】________quickly—too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13】________several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Communications project, and funded by the Engineering and Physical Sciences Research Council.
Existing LED light bulbs could be【C14】________to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】________with electronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】________to the point that they were not visible to humans and yet still【C17】________. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】________solid materials.
The makers of Li-Fi note that this quality might actually be an advantage in some【C19】________making Li-Fi more【C20】________than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.
【C1】
选项
A、subsequently
B、presently
C、lately
D、previously
答案
D
解析
本句提到Li-Fi的最快传输速度是3Gbit/s,今年早些时候(earlier this year)在德国测得。D项previously“以前”与earlier对应,故正确。该词也与本句谓语动词所使用的一般过去时(文章整体使用一般现在时)构成正确语法搭配。A项subsequently“后来”、B项presently“现在”、C项lately“最近”都是时间副词,但是与earlier相矛盾。
转载请注明原文地址:https://jikaoti.com/ti/Mz1iFFFM
0
考研英语二
相关试题推荐
AdecadeagobiologistsidentifiedaremoteprotectedareainnorthernLaos,calledNamEt-PhouLouey,asthecountry’sprobable
AdecadeagobiologistsidentifiedaremoteprotectedareainnorthernLaos,calledNamEt-PhouLouey,asthecountry’sprobable
AdecadeagobiologistsidentifiedaremoteprotectedareainnorthernLaos,calledNamEt-PhouLouey,asthecountry’sprobable
SupposeyouareamemberoftheStudents’Unionandyouruniversitywillholdanexperiencesharingmeetingaboutthepostgradua
Aphrasethatfirstbecamefashionableadecadeagoiseverywhere."Bringyourwholeself"isoneoffourvaluesthatBritishLa
Inanew【C1】________publishedinthejournalHeart,researchersfoundthatSwissadultswhotookoneortwodaytimenapsperwee
AndyWarholputitbest."YoucanbewatchingTVandseeCoca-Cola,andyouknowthatthePresidentdrinksCoke,andjustthink,
Forgetmilkydrinks,hotwaterbottlesorcurlingupwithagoodbook.Therealsecrettoagoodnight’ssleepmaybewhereyou
Forgetmilkydrinks,hotwaterbottlesorcurlingupwithagoodbook.Therealsecrettoagoodnight’ssleepmaybewhereyou
Forgetmilkydrinks,hotwaterbottlesorcurlingupwithagoodbook.Therealsecrettoagoodnight’ssleepmaybewhereyou
随机试题
下列哪项不是河南的道地药材
当工程网络计划中某项工作的实际进度偏差影响到总工期而需要通过缩短某些工作的持续时间调整进度计划时,这些工作是指()的可被压缩的工作。
《银行业监督管理法》规定:“本法所称银行业金融机构,是指在中华人民共和国境内设立的商业银行、城市信用合作社、农村信用合作社等吸收公众存款的金融机构以及政策性银行。”需要说明的是,“中华人民共和国境内”包含我国的台湾地区。()
某工业企业为增值税小规模纳税人,2012年10月9日购人材料一批,取得的增值税专用发票上注明的价款为10000元,增值税税额为1700元。材料入库前的挑选整理费为100元,材料已验收入库。则该企业取得的该材料的人账价值应为()元。
监控培训的(),可评估受训者在不同培训阶段的提高和进步幅度,及时发现差距并采取补救措施。
蚂蚁:左右
有权宣告婚姻关系无效的机关是()
爱国、敬业、诚信、友善,涵盖了
BuildYourTeaminNegotiationYouareleadinganegotiatingteamforyourcompany,facingoffwithamajorclienttoworko
HowtoDoWellonaJobInterviewAtypicalinterview—confusing,humiliating,andnerve-racking—【T1】______inthesameroomw
最新回复
(
0
)