考研英语二完形填空试卷78
8页1、考研英语二(完形填空) - 试卷 78( 总分: 120.00 ,做题时间: 90分钟 )一、 Use of English( 总题数:3,分数:120.00)1.Section I Use of EnglishDirections: Read the following text. Choose the best word(s) for eachnumbered blank and mark A, B, C or D. (分数: 40.00 )解析: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 10Gbit/s morethan 250 times faster than superfast broadband. The fastest speed【 C1】 reported was 3G
2、bit/s,achieved earlier this year in Germany. Chinese researchers also claimed this month to have【C2】 a 150Mbp/sconnection, but some experts were doubtful without seeing further【 C3】 The term Li-Fi was【 C4】 by Edinburgh Universitys Prof Harald Haas【 C5】 the technologyis 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 totraditional Wi-Fi. Both Wi-Fi and Li-Fi transmit dat
3、a【 C7】 the electromagnetic spectrum,but 【 C8】 Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【 C9】 advantagein 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 onand off 【 C12】 quickly too quickly to be noticed by the human eye. This most recentbreakthrough builds upon this by using tiny micro-LED bulbs to【 C13】 several lines of datain parallel. The research wa
4、s 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 technologywould also be of use in situations where radio frequencies cannot be used for fear of【 C15】 with electroniccircuit. 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 visibl
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