2. 外语
  3. Wi-Fi is a method of communication between computers without the use of wires. This is how it 【S1】______. One computer has a ver

Wi-Fi is a method of communication between computers without the use of wires. This is how it 【S1】______. One computer has a ver

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问题     Wi-Fi is a method of communication between computers without the use of wires. This is how it 【S1】______. One computer has a very small, low-power radio 【S2】______ and receiver device. It communicates with a device called a router(路由器) that is 【S3】______ to a second computer. The second computer is linked to the Internet in the 【S4】______ way by telephone. The router sends and receives signals to and from both computers.
    The first computer must be within several meters of the router for the system to work. 【S5】______ can be placed almost anywhere. Usually, a network of routers 【S6】______ a large area. As a result, a person with a small laptop computer can use the machine to link with the Internet at any place that has a router.
    Wi-Fi uses several frequencies at the same time. This prevents 【S7】______ and produces a clear radio signal. Most modern laptop computers search for the nearest Wi-Fi link as soon as they are turned on. The computer produces a message telling the owner if it has found a Wi-Fi link and how 【S8】______ the signal is.
    Wi-Fi is becoming 【S9】______ popular in the United States. Industry experts say that more than 64 million Wi-Fi systems are expected to be sold this year. More than 8.5 million American homes have Wi-Fi 【S10】______. Experts say this is expected to increase to 28 million homes in 2008.

              Word Bank:
A. commonly              I. works
B. covers                J. Routers
C. transmitter           K. fast
D. joined                L. attached
E. extremely             M. strong
F. traditional           N. equipment
G. signal                O. exercises
H. interference
选项
答案I
解析 根据句子结构此处应为一般现在时第三人称单数动词；根据文中第一句话可知此处谈的是无线上网技术的工作原理。exercise除“锻炼”之意外，还有“运用，使用”的意思，但它是及物动词，所以应选works。
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大学英语四级

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