单项选择题

The African way of communication sent messages ______.

A．in a special way
B．over a very short distance
C．by a musical instrument
D．at a rather slow speed
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单项选择题
Which of the following statements is true
A．Neither the Greek soldiers nor their enemy could understand the message.
B．African soldiers shouted from tower to tower to pass message.
C．Telephone was invented by a French engineer.
D．Only by using telephone could people send speech sounds quickly.
单项选择题
According to this passage, the Roman way of communication depended very much upon______.
A．fine weather
B．high tower
C．the spelling system
D．arm movements
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