(1)A．application
B．information system
C．network
D．operating system
答案：(1)D
解析：操作系统由几个主要部分组成，包括系统内核、存储管理系统、文件管理系统、设备驱动、系统库。
●For each blank，choose the best answer from the four choices and write down on the answer sheet.
(2)is a one—way function that takes an arbitrarily long piece of plain text and from it computes a fixed一length bit string．(3)is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection．(4)is an approach preferred by cable TV providers．In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable． (5)is a device used to connect two separate network that use different communication protocol． (6)is a digital-to—digital polar encoding method in which the signal level is always either positive or negative．
(2)A．DES
B．RSA
C．MD
D．MIB
(3)A.RTP
B．NNTP
C．RTTP
D．FTP
(4) A．ADSL
B．FTTC
C．FTTH
D．HFC
(5)A．Router
B．Gateway
C．hub
D．Bridge
(6)A．NNI
B．NAK
C．NRZ
D．NVT
答案：(2)C(3)B(4)D(5)B(6)C
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