单项选择题

The main purpose of this passage was

A．to provide training information to new pilots and navigators.
B．to motivate people's interest in space travel.
C．to explain how to use an inertial guidance system.
D．to describe the structure and importance of an inertial guidance system.

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单项选择题

According to the author, if a person is found guilty of a crime,

A．society is to be held responsible.
B．modem civilization is responsible for it.
C．the criminal himself should bear the blame.
D．the standards of living should be improved.

单项选择题

It can be interred from the article that an inertial guidance system is similar to

A．a gyroscope.
B．a high speed vehicle.
C．a navigator.
D．a submarine.