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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Everyone supported him, because his arguments（）sound facts.
A.
rested up
B.
rested on
C.
reported on
D.
reposed on
【单选题】Lens designers today______.
A.
have a large source of help to fall back on
B.
receive a low salary
C.
are less respectable than those of the past
D.
are not decisive in the lens design
【单选题】下列关于网络安全服务的叙述中，哪一个是错误的
A.
应提供访问控制服务以防止用户否认已接收的信息
B.
应提供认证服务以保证用户身份的真实性
C.
应提供数据完整性服务以防止信息在传输过程中被删除
D.
应提供保密性服务以防止传输的数据被截获或篡改
【单选题】加强执法形象的正规化建设，首先要规范( )，健全各警种执法执勤的工作规范，严格规范民警执法办案程序，规范执勤用语、动作、处理案(事)件的方式方法，加强养成教育，培养广大民警良好的职业风范。
A.
执法执勤
B.
行为举止
C.
规范外在标识
D.
办案程序
【单选题】21（） A．As B．Like C．Since D．Because
A.
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.
B.
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.
C.
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.
D.
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.
E.
(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.