【解析】选C。推理判断题。根据文章第一段The National Cryptologic Museum celebrated 60 years of cryptologic excellence in 2017. One event there marked the sixtieth anniversary of the National Security Agency. 可知。
2. According to the passage, which one is NOT right?
A. “Cryptologic” implies containing some hidden information.
B. The US decoded “AF” and won the victory in Midway Islands.
C. Both Rochefort and Nimitz were American navy commanders.
D. The US Marine Corps was fallen for in Midway Islands battle.
【解析】选D。细节理解题。根据文章第六段The battle that followed was a huge American victory. That victory was possible because Joseph Rochefort learned to read enough of the Japanese code to discover the meaning of the letters “AF”. 可知。
3. The Americans used the Navajo language in their coding system during World WarⅡ for the reason that ________ . A. it was the most beautiful language in the world
B. it was commonly used in coding system worldwide
C. the United States Marine Corps invented it then
D. unusual language was successfully used for codes
【解析】选D。细节理解题。根据文章第八段Very few people outside the Navajo nation are able to speak any of their very difficult language. 可知。
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