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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热门试题

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

This passage is mainly about ______.

A．nutrition
B．vitamins
C．vegetables
D．health