Storekeepers use codes to mark their goods. The codes show how much is paid for the goods or when they are added to the stock. Businessmen use codes to hide plans from their business enemies. Sometimes personal letters or diaries are written in code. Many people enjoy figuring out codes and ciphers simply as a hobby.

　　In the 16th century，codes and ciphers were very popular among scientists. They wrote messages to each other in code so that no one else would learn their secrets. Geronimo Gardano，an Italian astrologer (占星家)，mathematician，and doctor，invented the trellis cipher. He took two sheets of paper and cut exactly the same holes in each one. Then he sent one sheet，which he called a trellis，to a friend and kept the other for himself. Whenever he wanted to write a message，he put his trellis over a clean sheet of paper and wrote the secret message through the holes. There he removed the trellis and filled the rest of the paper with words that would make sense. When his friend received it，he put his trellis over the writing and read the secret message.

　　The best title of this passage would be________.

　　Codes and ciphers

　　B. Differences between codes and ciphers

　　C. History of codes and ciphers

　　D. Inventors of codes and ciphers

　　29.Which of the following statements is TRUE？

　　Ciphers can be broken or figured out more easily than codes.

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