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.
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单项选择题
A．Preparing for an important test.B．Funding for university education.C．Winning the confidence of voters.D．Graduate school application procedures.
A．Preparing for an important test.
B．Funding for university education.
C．Winning the confidence of voters.
D．Graduate school application procedures.
填空题
What does the passage mainly discuss
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