单项选择题

The best title for this passage is ______.

A．American Way of living
B．Psychological Space
C．Space Needs in Different Countries
D．Psychological Space and Economic Pressures
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单项选择题
This story is mainly about ______.
A．the distance between the sun and the other stars
B．the problems of traveling to faraway stars
C．what happens when we travel faster than the speed of light
D．the tool we use when we measure the distance of faraway stars
单项选择题
If a stone moved at the speed of light, it ______.
A．would weigh twice more than it is motionless
B．would weigh as much as it is on earth
C．would weigh less than it is on earth
D．would have no weight at all
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