单项选择题

A rocket might miss its target, by a "wide margin". This means the rocket missed the target ______.

A．because of mechanical failure
B．by a great deal
C．by a small distance
D．because the target moved
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单项选择题
This passage deals mainly with ______.
A．the gravitational pull of the Earth and the moon
B．the factors involved in firing a rocket into the outer-space
C．the gravitational fields of the Earth and the moon
D．the speed and direction of a rocket traveling in the outer-space
单项选择题
According to the passage, the most difficult task of fining a rocket is ______.
A．to get the rocket into the space
B．to calculate the rocket's velocity of escape
C．to guide the rocket after it leaves the Earth's surface
D．to identify the gravitational fields of the Earth and the moon
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