单项选择题

What does "an earthbound rocket" in Sentence 3 Para. 3 mean

A．A rocket sent from the earth to the moon.
B．A rocket sent from the moon to the earth.
C．A rocket made of earth.
D．A rocket with no purpose.
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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
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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