单项选择题

Passage Three Questions 18 to 20 are based on the passage you have just heard.

A．A majority of Americans voted for it.
B．Large trucks were causing many accidents.
C．There was a sudden increase in highway death.
D．A fuel shortage was developing.
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单项选择题
A．There is a danger of accidents on the line.B．There is no danger of accidents on the line.C．Their speeds will be automatically fixed by the computers.D．One train will keep a safe distance from the other trains.
A．There is a danger of accidents on the line.
B．There is no danger of accidents on the line.
C．Their speeds will be automatically fixed by the computers.
D．One train will keep a safe distance from the other trains.
单项选择题
A．To drive the train after it is started automatically.B．To start the train and to drive it when necessary.C．To take care of the passengers on the train.D．To send commanding signals to the command spot.
A．To drive the train after it is started automatically.
B．To start the train and to drive it when necessary.
C．To take care of the passengers on the train.
D．To send commanding signals to the command spot.
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