In most Hollywood movies, the Native American Navajos still fight on horses in the American Southwest.But during World War II, a group of Navajos made their language into a weapon to protect the United States. They were the Navajo Code Talkers, and theirs is one of the few unbroken codes( 电码)in military history.

Navajo was the perfect choice for a secret language. It is very complex. One vowel (元音) can have up to ten different pronunciations, changing the meaning of any word. In the 1940s, Navajo was an unwritten language. No one outside of the reservation(居留地) could speak it or understand it.

　　 The Navajo Code team had to invent new words to describe military equipment. For example, they named ships after fish: lotso-whale (battleship), calo-shark (destroyer), and beshloiron-fish( submarine). When a Code Talker received a message via radio, he heard a series of unrelated Navajo words. He would then translate the words into English and use the first letter of each English word to spell the message. The Navajo words tsah (needle), wol-la-chee(ant), ah-kh-di-glini(victor), and tsah-ah-dzoh(yucca) spelled NAVY.

　 The Code Talkers kept the code a secret. They memorized everything. There were no code books. As a result,no ordinary Navajo soldier, if captured by the enemy, could understand the code. More than 3, 600 Navajos served in World War II, but only 420 were Code Talkers with the US Marines. They coded and decoded battlefield messages better and faster than any machine. They could encode, transmit, and decode a three-line English message in 20seconds. Machines of the time required 30 minutes to perform the same job.

Even after the war the code remained top secret. When they were asked about their role, Code Talkers just said,"I was a radioman. " War movies and histories came out without mentioning them. The code was never used again and was finally declassified(撤销保密)in1968. Only then did the secret come out.

7.What does the underlined word"theirs"in the first paragraph refer to?

A. The Navajo Code Talkers B. The Navajo language.

C. The US Marines D. The Navajo history.

8 According to the text, the Navajo language

A. had complex spoken and written forms B. was understood only by the Navajos

C. was created during the 1940s D. had ten vowels in total

9. What did the Navajo Code team do after receiving a message?

A. Putting the unrelated Navajo words in order.

B. Recording it in Navajo letters.

C. Inventing some military words.

D.Turning it into English.

10 .What is the best title for the text?

A. An Unbreakable Code B. Movies About the Navajo Language

C. Native American Navajos D. Code Talkers During World War II

第二节 （共 5 小题，每小题 2 分，满分 10 分）