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If the Internet was the information superhighway, 5G is a future where every street is a highway: no speed limits, no data bottl

admin2022-05-13  67
问题     If the Internet was the information superhighway, 5G is a future where every street is a highway: no speed limits, no data bottlenecks. It’s a future perhaps as game-changing as the Internet itself.
    What is 5G? It’s the fifth generation of cellphone service, using three different portions of the spectrum to create a superfast and much more reliable service even if you’re sitting in a basement or stuck in an underground tunnel during rush hour. It’s this reliability of communications—wherever you are—that could lead to innovative products and services.
    Downloads will be more than 10 times as fast as a good 4G connection, meaning you could download a full movie to your phone in seconds rather than minutes. Also, wireless companies could begin competing with cable firms to offer home Internet and TV service.
    Your city’s traffic grid would communicate with cars and vice versa to reduce bottlenecks and improve safety. Smart homes would become smarter and easier to set up. Since 5G would virtually eliminate any delays in streaming video, workers could operate machines remotely and shoppers at home could "try on" clothes by watching a 3D image of themselves dressed in the duds. Futurists call this "the Internet of things," where everything can communicate with everything else.
    Estimates suggest carriers in the U. S. will offer 5G as a premium service at first. Verizon, for example, plans to charge $10 a month extra for the service. Its 5G phones range from $1,000 to $1,300. The rewards to companies could be amazing, with one forecast predicting a $277 billion global market by 2025.
    To achieve higher speeds, 5G uses radio waves in a new area of the spectrum. These radio waves don’t do a good job penetrating walls and buildings, so 5G carriers will have to build a much denser network of small transmitters to complement today’s cell-tower technology. Some critics have raised concerns that exposure to so many radio waves could have health effects. The industry says no studies have uncovered any problems.
    Other experts raise concerns that China-based Huawei, one of the most advanced, and cheapest manufacturers of many 5G network components, will use its equipment to give the Chinese government a secret back door to the data. The Trump administration banned U. S. companies from selling equipment to Huawei, but is now considering exempting some companies from that ban. Britain shows little concern, since its carriers building 5G networks are reportedly using Huawei parts. India, by contrast, has kept away from using Huawei components, even after the company offered assurances there would be no back door.
According to the first two paragraphs, 5G communications are characterized by being________.
选项 A、limited
B、reliable
C、innovative
D、different
答案B
解析 细节题。根据题干可定位至文章前两段。根据第一段第一句中的no speed limit。“没有速度限制”，可以排除A项limited受限的；根据第二段第二句中的more reliable service“更可靠的服务”及第三句It’s this reliability of communications—wherever you are________that could lead to innovative products and services. 该句通过强调句句式It is…that…的结构强调了5G通信的reliability“可靠性”特点，故B项reliable“可靠的”为正确选项；同时该句中innovative一词修饰之后的products“产品”和service“服务”，而非communications，故排除；different原文虽然有提及，但是亦非communications的特点，故排除。故本题答案为B项。
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