●There are many page replacement algorithms in the page management．Most frequently used algorithm is (69) ．
(69) A．FIFO
B．LRU
C．OPT
D．PPT
●By using MP3，a 600M-byte music CD can be (70) to 50M bytes or less.It can be streamed(downloaded in chunks)so that you can begin listening to the opening bars while the (71) of the file arrives in the background．And，most important，MP3 music files retain good listening (72) that (73) compression schemes lacked．That (74) of features makes accessing and distributing music on the Web practical for the first time.
(70) A．pressed
B．compressed
C．press
D．compress
(71) A．past
B．other
C．rest
D．host
(72) A．voice
B．mass
C．quantity
D．quality
(73) A．earlier
B．front
C．backward
D．later
(74) A．a(chǎn)dd
B．combination
C．difference
D．condition
●One use of networks is to let several computers share (75) such as file systems，printers，and tape drives.
(75) A．CPU
B．memory
C．resources
D．information
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