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 A Digital Code Has Wide Applications B Floppy Disks Are Outdated C CDs Are Durable D CD’s Working Principle Is Explained E

A Digital Code Has Wide Applications B Floppy Disks Are Outdated C CDs Are Durable D CD’s Working Principle Is Explained E

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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B  Floppy Disks Are Outdated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
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选项
答案F
解析 第四段第一句"There are many types of compact disks."是主题句。本段其他句子列举了两种常用的CD格式(format)，种是CD-RW，另一种是CD-ROM。选项F的"CDs are of many formats"概括了本段的大意，是答案。
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