We can infer from this passage that______.A. people cannot sent visible information until 19th centuryB. we cannot communicate without soundC. the ways of communication are similar in different countriesD. in ancient time, enough people is necessary to send messages over distance
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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