听力原文: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? (19) 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.
A.W: B. Q: C.How D. B.What E. C.Why F. D.How
【参考答案】
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......