单项选择题

The velocity of escape is about ______.

A．40,200 miles per minute
B．25,000 kilometers per hour
C．40,200 kilometers per hour
D．25,000 miles per minute
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单项选择题
It can be inferred that if a rocket misses its target, it keeps on traveling through space until ______.
A．it reaches the "black hole"
B．it is caught in the gravitational field of another planet
C．it runs out of fuel
D．it explodes
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