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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单项选择题
This short passage is mainly about ______.
A．the rocket
B．the pull of the earth
C．the pull of the moon
D．the gravitational pull of the earth and moon
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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