赞题库-背景图

单项选择题

The way of communication ______ made use of were visible signs.

A．French
B．Roman
C．African
D．American

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热门试题

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

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.