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．Before it gets colder.B．Before it gets warmer.C．Before it becomes windy.D．Before wet weather comes.
A．Before it gets colder.
B．Before it gets warmer.
C．Before it becomes windy.
D．Before wet weather comes.
单项选择题
A．He hasn’t cleaned his room since Linda visited him.B．Linda is the only person who ever comes to see him.C．He’s been too busy to clean his room.D．Cleaning is the last thing he wants to do.
A．He hasn’t cleaned his room since Linda visited him.
B．Linda is the only person who ever comes to see him.
C．He’s been too busy to clean his room.
D．Cleaning is the last thing he wants to do.
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