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.

　　Science keeps on developing. It may not be many more years before a completely new technology is invented5 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.

　　41 Music is recorded onto CDs as

　　A laser beams

　　B digital codes

　　C musical notes

　　D special sounds

　　42 E-mail is mentioned in the third paragraph to show

　　A the variety of digital communications

　　B the development of new technologies

　　C the usefulness of digital codes

　　D the relationship between communication and technology

　　43 One of the differences between CD-RWs and CD-ROMs is

　　A CD-ROMs can be used for longer time

　　B CD-ROMs cannot be rewritten on

　　C CD-RWs hold more information

　　D CD-RWs are merely used for music recording

　　44 CDs can last a long time if

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