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. He has had thirteen decayed teeth. B. He doesn’t have a single decayed tooth. C. He has fewer decayed teeth than other people of his age. D. He never had a single tooth pulled out before he was fifty.
A. He has had thirteen decayed teeth.
B. He doesn’t have a single decayed tooth.
C. He has fewer decayed teeth than other people of his age.
D. He never had a single tooth pulled out before he was fifty.
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