Questions 9 to 11 are based on the passage you have just heard.
9. A)Learning others’ secrets.
C)Decoding secret messages.
B) Searching for information.
D)Spreading sensational news.
10.A)They helped the U.S. army in World War Ⅱ.
B) They could write down spoken codes promptly.
C) They were assigned to decode enemy messages.
D) They were good at breaking enemy secret codes.
11. A)Important battles fought in the Pacific War.
B)Decoding of secret messages in war times.
C) A military code that was never broken.
D)Navajo Indians’ contribution to code breaking
传世之音
声音很好听，互粉一下,多谢！