We can infer from this passage that______.
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
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试题解析
55.答案为D 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。