B. You could read some words in Geronimo's letter without his trellis.

　　C. The first person who ever used a cipher in history was Julius Caesar.

　　D. Fondness of using codes was the hobby of the scientists in the 1600s.

　　30.According to Geronimo Gardano，a trellis is ________.

　　a piece of paper with many small holes

　　B. a secret message with a lot of small holes

　　C. a letter with unreadable words and sentences

　　D. a sheet of paper with groups of Arabic figures

　　31.It is NOT mentioned in the passage that codes and ciphers are used for the purpose of ________.

　　military affairs

　　B. commercial secrets

　　C. scientific achievements

　　D. personal enjoyment

　　D

　　Some inventions are so useful, but seem so simple, that we wonder why no one thought of them long ago.

　　Post-it Notes were invented about twenty years ago by Art Fry, a scientist at 3M Company. The idea for the product came from an awful experience he often had while singing in his church choir. Fry used pieces of paper as bookmarks to mark the places in his book of songs, but these bookmarks were always falling out. Around that time, Fry heard about a new adhesive (粘合剂) that a colleague, Dr. Spence Silver, had created. This adhesive was special because it was strong enough to hold papers together, but not strong enough to tear the paper when it was removed.

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