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江苏省2010届高考英语任务型阅读精华练习(九)
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  • 资源类别试题
    资源子类试题汇编
  • 教材版本译林牛津版(现行教材)
    所属学科高中英语
  • 适用年级高三年级
    适用地区新课标地区
  • 文件大小89 K
    上传用户ruyiwang
  • 更新时间2010/3/12 13:50:53
    下载统计今日0 总计224
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资源简介
   If you and your friends wish to share a secret, you can write it in code, and no one else will be able to read it. Codes are one way of writing in secrets. Ciphers(暗码) are another. In the code each word is written as a secret code or word number. In a cipher each letter is changed.
Codes and ciphers have played an important role in the history of the word. Julius Caesar, the Roman ruler who defeated almost all the countries in Europe about 2000years ago, used a cipher when he sent secret messages to his troops. During American Revolution, George Washington’s spies used a kind of code to send him information about the enemy before his military(军事的) action. In World War 2,the American “broke”, or figured out, Japan’s most important navy codes and got enough information to destroy a powerful Japanese fleet(舰队)。
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