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
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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
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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