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  3. Roman soldiers in some places built long rows of signal towers. When they had a message to send, the soldiers shouted it from to

Roman soldiers in some places built long rows of signal towers. When they had a message to send, the soldiers shouted it from to

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问题     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 words with flags and arms.
    Over a long period of time, people sent messages by all these different ways.  However, not until the telephone was invented in America in the nineteenth century could people send speech sounds over a great distance in just a few seconds.
We can infer from this passage that______.
选项 A、people cannot sent visible information until 19th century
B、we cannot communicate without sound
C、the ways of communication are similar in different countries
D、in ancient time, enough people is necessary to send messages over distance
答案D
解析 通过阅读前三段可知古代的信息需要足够的人手来依次传递才有可能传送到很远的距离。
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