单项选择题

Precise calculations are ______.

A．good guesses
B．simple problems
C．big errors
D．exact
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单项选择题
It can be seen that if a rocket misses its target, it keeps on traveling through space until ______.
A．it burns up
B．it is caught in the gravitational field of another planet
C．it is brought back to the Earth by scientists
D．it runs out of fuel
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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