从供选择的答案中，选出应填入下面叙述中{ }内的最确切的解答，把相应编号写在答卷的对应栏内。
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.
供选择的答案
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】
提示参考译文：局域网是将许多设备互连在一起并提供一种在这些设备间交换信息的方法的通信网。局域网的范围通常比较小，如一个建筑物或一群建筑物。局域网通常为拥有那些连接在网上的设备的同一组织所拥有。局域网的内部传输率至少为几兆字节每秒。局域网的基本通讯方式为广播方式。每个站都有一个转发/接收器，通过一个与其他站共享的媒介来通讯。从任何一个站发送的消息都被广播发送到所有的站，被所有的站接收。
【答案】A：④ B：⑦ C：② D：⑧ E：①
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