【名词&注释】
路由器(router)、应用层(application layer)、集线器(hub)、数据包(packet)、中继器(repeater)、物理层(physical layer)、数据链路层(data link layer)、快捷方式(shortcut)、商业用途(commercial use)、输入/输出设备
[单选题]删除Windows中某个应用程序的快捷方式(shortcut)，意味着______。
A. 该应用程序连同其快捷方式(shortcut)一起被删除
B. 该应用程序连同其快捷方式(shortcut)一起被隐藏
C. 只删除了快捷方式(shortcut)，对应的应用程序被保留
D. 只删除了该应用程序，对应的快捷方式(shortcut)被隐藏
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举一反三：
[单选题]Applications put computers to practical business(67), but below the(68)it's the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program, connect to networks and store(69).A traditional kernel provides all the functions for applications. The kernel(70)memory, I/0 devices and parcels out processor time.
A. The kernel also supports security and fault(71), which is the ability to recover automatically when parts of the system fail.
B. used
C. use
D. apply
E. applied
[多选题]● Networks can be interconnected by different devices. In the physical layer，networks can be connected by（1）or hubs，which just move the bits from one network to an identical network. One layer up we find bridges and switches，which operate at data link layer. They can accept（2）,examine the MAC address，and forward the frames to a different network while doing minor protocol translation in the process. In the network layer，we have routers that can connect two networks. If two networks have（3）network layer， the router may be able to translate between the packet formats. In the transport layer we find transport gateway， which can interface between two transport connections. Finally，in the application layer， application gateways translate message（4）.As an example， gateways between Internet e-mail and X.400 e-mail must （5）the e-mail message and change various header fields.（1）
A. reapers
B. relays
C. connectors
D. modems
E. （2）
F. frames
G. packets
H. packages
I. cells
J. （3）
K. specia l
L. dependent
M. similar
N. dissimilar
O. （4）
P. syntax
Q. semantics
R. language
S. format
T. （5）
U. analyze
V. parse
W. delete
X. create
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