| Roman soldiers in some places built
long rows of signal towers. When they had a message to send, the soldiers
shouted it from tower to tower. If there were enough towers and enough soldiers
with loud voices, important news could be sent quickly over distance. In Africa, people learned to send messages by beating on a series of large drums (鼓). Each drum was kept within hearing distance of the next one. The drum beats were sent out in a special way that all the drummers understood. Though the messages were simple, they could be sent at great speed for hundreds of miles. In the eighteenth century, a French engineer found a new way to send short messages. In this way, a person held a flag in each hand and the arms were moved to various positions representing different letters of the alphabet (字母表). It was like spelling out wor A. fine weather B. high tower C. the spelling system D. arm movements [单项选择]I don’t quite {{U}}follow{{/U}} what she is saying
A. believe B. understand C. explain D. accept [单项选择]Where did the conversation most probably take place
A. In a library. B. In a classroom. C. In a bookstore. D. In a hotel. [单项选择]When did this conversation most probably take place
A. On the 10th. B. On the 8th. C. On the 6th. D. On the 11th. 我来回答: 提交
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