2013
高考英语重庆八中二轮阅读理解精选训练（10）及答案 a 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 secret. ciphers (暗码)are another. in a code each word is written as a secret code word or a code number. in a cipher each letter is changed. codes and ciphers have played an important role in the history of the world. julius caesar，the roman ruler who defeated almost all the countries in europe about 2,000 years ago，used a cipher when he sent secret messag
