2. 外语
  3. A Digital Code Has Wide Applications B Floppy Disks Are Outdated C CDs Are Durable D CD’s Working Principle Is Explained E

A Digital Code Has Wide Applications B Floppy Disks Are Outdated C CDs Are Durable D CD’s Working Principle Is Explained E

admin2009-06-15  100
问题 A  Digital Code Has Wide Applications
B  Floppy Disks Are Outdated
C  CDs Are Durable
D  CD’s Working Principle Is Explained
E  CD-RWs Play Better Than CD-ROMs
F  CDs Are of Many Formats
*
选项
答案A
解析 第三段第一句"Digital codes are used with many technologies."是主题句。本段其他句子提供例证，即应用领域。作者例举了5个领域：电邮、航天通讯、条码、手机和天气预报。选项A的"Digital code has wide applications"与主题句的意思完全吻合，所以是答案。
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