5 CDs were first sold to the public in 1982. These CDs still play well and sound fine. Current CDs are expected to last between 70 to 200 years. Of course, you can make sure your CDs last a long time by taking care of them.
6 Science keeps on developing. It may not be many more years before a completely new technology is invented and introduced to the public for music recording. In the meantime, there is no doubt you will continue to enjoy listening to your favorite music on CDs6 and playing your favorite computer games on CD-ROMs.
练习:
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ADigital code has wide applications.
BFloppy disks are outdated.
CCDs are durable.
DCDs working principle is explained.
ECD-RWs play better than CD-ROMs.
FCDs are of many formats.
5. One advantage of CD-RWs is that they can __________ like floppy disks.
6. The author predicts it will not __________ before a new technology is invented for music recording.
7. The laser beam-emitting device and the receiver are considered to _______ of a CD player.
8. Space probes could not __________ without using digital codes.
A. shine on bumps
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