问答题

_________________(战争断断续续打了许多年)，but everyone in the family was safe．

【参考答案】

The war lasted off and on for dozens of years
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单项选择题
What significance did Turing’’s theory have on the development of AI
A．It invented the AI computer language.
B．It established the expert system.
C．It taught technicians how to use complicated programs.
D．It started the research on Al.
填空题
A．lengthB．intervalC．periodD．meantime
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