单项选择题

Which of the following is TRUE according to the passage

A．Americans are trained to living in large rooms at birth.
B．Economic situation decides one's amount of space needs.
C．People in various countries demand different psychological space.
D．Knowing your psychological space needs in important, as it affects your future.
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单项选择题
Why do we measure the distance in light-years instead of miles
A．Units of light-years sound better.
B．Using light-years reduced the number of figures used.
C．We used to measure distance in light-years long ago.
D．We do not make mistakes when we use light-years.
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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