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Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with UK

admin2023-02-24  21
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.
【C9】
选项 A、dubious
B、additional
C、distinguishable
D、distinct
答案D
解析 上文提到，Wi-Fi利用的是无线电波，Li-Fi利用的是可见光波，本句顺接上文，说这是一种优势(advantage)，因为可见光波谱比无线电频谱要丰富得多。D项distinct与advantage搭配表示“明显的优势”，符合语义。A项dubious和advantage搭配后表示“不确定的”优势，与本句逻辑相反。B项additional指“额外的”，那么上文应有提到Li-Fi的其他优势。上句提到成本低、效率高的原因是Li-Fi利用的是可见光波，本句是对这个优势的进一步解释，而不是额外的优势。C项distinguishable“可区别的”与优势搭配，语义不通。
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