单项选择题

A．To drive the train after it is started automatically.
B．To start the train and drive it when necessary.
C．To take care of the passengers in the train.
D．To send commanding signals to the command spot.
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单项选择题
A．Waved their hands.B．Shout and cried.C．Waved their shirts.D．Made a fire.
A．Waved their hands.
B．Shout and cried.
C．Waved their shirts.
D．Made a fire.
单项选择题
A．Man knows where the society is going.B．People don’t welcome the rapid development of our modern society.C．The speaker is worried about the future of our modern society.D．Man can do nothing about the problem of pollution.
A．Man knows where the society is going.
B．People don’t welcome the rapid development of our modern society.
C．The speaker is worried about the future of our modern society.
D．Man can do nothing about the problem of pollution.
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