從供選擇的答案中，選出應填入下面敘述中{ }內的最確切的解答，把相應編號寫在答卷的對應欄內。��

　　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��

　�、醡odem ⑩output 11. switch 12. relay��

　　C：①adopted ②attached ③selected ④unified��

　　【解析】��

　　提示參考譯文：局域網是將許多設備互連在一起并提供一種在這些設備間交換信息的方法的通信網。局域網的范圍通常比較小，如一個建筑物或一群建筑物。局域網通常為擁有那些連接在網上的設備的同一組織所擁有。局域網的內部傳輸率至少為幾兆字節(jié)每秒。局域網的基本通訊方式為廣播方式。每個站都有一個轉發(fā)/接收器，通過一個與其他站共享的媒介來通訊。從任何一個站發(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

[1] [2] 下一頁