A、How primitive people used flags. B、What the ancient means of communication was. C、Why the torch towers were built. D、How the G

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问题  
W: There is a direct flight at 10 o’clock or a flight at 2 this afternoon that stops over in San Francisco.
M: I think I’d rather have the earlier one so I can go to work tomorrow.
Q: What relationship do these people have?
M: People first sent signals by flags, some archaeologists observed.
W: No. I think they exchanged news by smoke, hence the torch towers on the Great Wall.
Q: What are they discussing?

选项 A、How primitive people used flags.
B、What the ancient means of communication was.
C、Why the torch towers were built.
D、How the Great Wall came into being.

答案B

解析 综合推断题。男士说考古学家发现人们最早是通过旗帜来发送信号,而女士则认为人们最早是用烟作为信号,并以长城的烽火台为例,由此可知,B正确。
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