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  3. A recent development is the local area network (LAN).【21】its name implies, it serves a local area-possibly as small as a single

A recent development is the local area network (LAN).【21】its name implies, it serves a local area-possibly as small as a single

admin2011-04-26  14
问题     A recent development is the local area network (LAN).【21】its name implies, it serves a local area-possibly as small as a single room, typically an area like an university campus or the premises of a particular business. Local area networks were developed to【22】a need specific to microcomputers the sharing of expensive resources. Microcomputers are cheap, but highcapacity disc stores, fast and/or good quality printers, etc. are expensive. The object of the LAN is to allow【23】microcomputers shared access to these expensive resources, since the microcomputers are cheap, it is a necessary feature of a LAN that the method of connection to the network, and the network hardware【24】, must also be cheap.
    A local area network links a number of computers and a number of servers which provide communal facilities, e. g. file storage. (A server usually includes a small microprocessor for control purposes. ) The computers and servers are known as stations. There are two methods of【25】in common use, rings and broadcast networks.
    In the ring method( often called a Cambridge Ring) all the stations are linked in a ring,【26】includes one special station, the monitor station.
    In broadcast networks, all the stations are【27】to a single linear cable(usually coax cable), and any transmission will be received by all stations.
  【28】technology is used, local area networks are a development of the greatest importance.【29】as programming is simplified by an approach that thinks in terms of small procedures or programs, each doing a well-defined job, the computer system of tomorrow is likely to be【30】lots of small systems, each doing a specific job, linked by a local area network.
选项 A、that
B、who
C、when
D、which
答案D
解析
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