单项选择题

The best title for this passage is______.

A．The Earth Weight
B．Weight in Space
C．Changing Weight on the Earth
D．Weight on and off the Earth
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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
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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