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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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.
单项选择题
Where is the gravitational pull of both the earth and the moon on an object equal
A．In the middle between the earth and the moon.
B．A point closer to the earth between the moon and the earth.
C．A point closer to the moon between the earth and the moon.
D．No such point exists.
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