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
If the distance between two objects is shortened by half, their gravitational attraction will______.
A．double
B．become four times stronger
C．be the same
D．get four times weaker
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
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