A local-area network(LAN) is a communications network that { A } a variety of devices and provides a { B }for information exchange among those devices. The scope of the LAN is small typically a single building or a cluster of builings. The LAN is usually owned by the same organlization that owns the { C } devices.The internal data rate of LAN is at least several Mbit/s. The basic of LAN communciation is broadcasting. At each station, there is a transmitter/receiver that commuinciates over a { D }shared by other stations. A transmission from any one station is { E }to an received by all other stations.

　　供選擇的答案

　　A、B、D、E：①broadcast ②cable ③control ④interconnects

　　⑤internet ⑥meander ⑦means ⑧medium

　　⑨modem ⑩output 11. switch 12. relay

　　C：①adopted ②attached ③selected ④unified

　　【解析】

　　參考譯文：局域網(wǎng)是將許多設(shè)備互連在一起并提供一種在這些設(shè)備間交換信息的方法的通信網(wǎng)。局域網(wǎng)的范圍通常比較小，如一個(gè)建筑物或一群建筑物。局域網(wǎng)通常為擁有那些連接在網(wǎng)上的設(shè)備的同一組織所擁有。局域網(wǎng)的內(nèi)部傳輸率至少為幾兆字節(jié)每秒。局域網(wǎng)的基本通訊方式為廣播方式。每個(gè)站都有一個(gè)轉(zhuǎn)發(fā)/接收器，通過(guò)一個(gè)與其他站共享的媒介來(lái)通訊。從任何一個(gè)站發(fā)送的消息都被廣播發(fā)送到所有的站，被所有的站接收。

　　【答案】A：④ B：⑦ C：② D：⑧ E：①

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