A. ￡180

　　B.￡175

　　C. ￡170

　　D. ￡160

　　. According to the passage, the tour _________.

　　A. is intended for individuals only

　　B. takes three hours on a sightseeing vehicle

　　C. has been voted the best tour in London three times

　　D. offers chances to take great photos

　　26. According to the passage, which statement is NOT true?

　　A. Hairy Goat organizes the tour.

　　B. All the tours are not to be booked in advance.

　　C. People can go through the website to find the date.

　　D. The tour finishes at the same location every day.

　　27. The passage is written mainly to __________.

　　A. introduce the best thing to do in London

　　B. show more information about London

　　C. attract people to take the tour in London

　　D. encourage people to walk instead of driving

　　C

　　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 messages to his troops. During the American Revolution，George Washington's spies used a kind of code to send his information about the enemy before his military action. In World War Ⅱ，the Americans“broke”or figured out Japan's most important navy codes and got enough information to destroy a powerful Japanese fleet.

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