任务型阅读练习十二篇(11)

有用

Whatever the arguments for and against word processor, they are a key feature (特征) of this

revolution in office practice.

（九）

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）

百度搜索“77cn”或“免费范文网”即可找到本站免费阅读全部范文。收藏本站方便下次阅读，免费范文网，提供经典小说教育文库任务型阅读练习十二篇(11)在线全文阅读。