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．She has to work very late on Friday night.B．She’s never met the man’s sister.C．She never gave the man a call.D．She cannot accept the man’s invitation.
A．She has to work very late on Friday night.
B．She’s never met the man’s sister.
C．She never gave the man a call.
D．She cannot accept the man’s invitation.
单项选择题
A．By barking in order to attract people’s attention.B．By pulling the baby to safety.C．By comforting the baby until help came.D．By protecting the baby against the fire.
A．By barking in order to attract people’s attention.
B．By pulling the baby to safety.
C．By comforting the baby until help came.
D．By protecting the baby against the fire.
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