A. in the 1920s
B. in the 1930s
C. in the 1940s
D. in the 1950s
A. break enemy’s code
B. call other soldiers
C. do calculations
D. study geography
A. to teach at academic school
B. to sell to other countries
C. to spread knowledge
D. to include the military industrial complex
A. INTRANET
B. CONPANET
C. INTERNET
D. ARPPANET
A. by the late 1980s
B. by the late 1970s
C. by the late 1990s
D. by the late 1960s
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