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 a big appetite.B．He eats only at regulate mealtimes.C．He avoids new foods.D．He eats only healthful foods.
A．He has a big appetite.
B．He eats only at regulate mealtimes.
C．He avoids new foods.
D．He eats only healthful foods.
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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