单项选择题

If an object weighed one pound 8,000 miles above the earth, it would weigh ______ on the surface of the earth.

A．6 pounds
B．4 pounds
C．9 pounds
D．1/9 pound
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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
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
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