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
We can feel things are heavy because ______.
A．weight is a fixed quality in an object
B．they are far away from the center of the earth
C．of the earth's strong attraction for them
D．they are not taken away from the surface of the earth
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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