After the war,the Japanese chief of intelligence, Lt. General Seizo Arisue, admitted that his forces were never able to break the code used by the US Marine Corps(海军陆战队) .Be?cause the Navajo code talkers were the secret code of the Marines, they were often heavily guarded.

  The use of the Navajo Code was so successful that some code talkers were guarded by fel?low Marines, whose role was to kill them in case of possible capture by the enemy.

  In 1942 ,when the original 29 code talkers developed their "secret weapon" ,there were a-bout 50,000 members of the Navajo nation. By the end of the war, 540 men had served as Ma?rines. At least 400 of those were trained as code talkers.

  For decades following the war,the Navajos' contribution went unrecognized due to national security issues. It wasn't until 1968 that anyone outside the military knew about the code. The code talkers were even forbidden to tell their families about it. But in July of 2001 ,the President and Congress of the United States honored the 29 code creators. Only five were still alive. The remarks of President Bush expressed the late thankfulness of a nation whose victory in the Pacific may not have been possible without the Navajos. When the President spoke, he addressed the men whose grandfathers had made the "Long Walk" to their new home 78 years before the code talkers became Marines.

In 2002 the code talkers were honored with a movie that pictured their brave behavior:Windtalkers. For the first time,people everywhere learned their story. 

(   ) 5. The purpose of the text is to        .

   A.introduce America's Navajo nation

   B.recommend the movie Windtalkers

   C.tell readers about the Navajo Code

   D.recall America's victory in the Pacific

(   ) 6. To a guard of a code talker, the most important is        .

   A.keeping the code talker alive

   B.ensuring the safety of the code

   C.preventing the code talker escaping

   D.staying with the code talker all the time

(   ) 7. We can learn from the passage that during the war        .

   A.most of the Navajos were killed

   B.many code talkers were captured by Japanese soldiers

   C.about one percent of the Navajos served as Marines

   D.the Navajos made the " Long Walk" to fight against the Japanese

(   ) 8. How long was the story of the code talkers known by people everywhere since it was created?

    A. After 26 years.   B. After 29 years.

   C. After 49 years.   D. After 60 years.

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