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．Suggest a topic for a research paper.B．Tell her what to study for the history test.C．Write a favorable letter of recommendation.D．Advise her about how to run an election campaign.
A．Suggest a topic for a research paper.
B．Tell her what to study for the history test.
C．Write a favorable letter of recommendation.
D．Advise her about how to run an election campaign.
单项选择题
A．Music they like can relieve depression but distract attention.B．Music they like can reduce stress and improve concentration.C．Classical music and rock-and-roll increase their heart rate and expand the breathing.D．Wearing headphones can help concentrate when they are performing operations.
A．Music they like can relieve depression but distract attention.
B．Music they like can reduce stress and improve concentration.
C．Classical music and rock-and-roll increase their heart rate and expand the breathing.
D．Wearing headphones can help concentrate when they are performing operations.
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