单项选择题

A．It will move on at the same speed.
B．It will stop automatically.
C．It will gradually slow down.
D．It will keep a safe distance from the other trains.
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单项选择题
A．They needn’t pay at all.B．The boys must pay for the girls.C．The girls must pay for themselves.D．The organizers should pay for the girls.
A．They needn’t pay at all.
B．The boys must pay for the girls.
C．The girls must pay for themselves.
D．The organizers should pay for the girls.
单项选择题
A．A computer.B．A platform worker.C．The command spot.D．A machine.
A．A computer.
B．A platform worker.
C．The command spot.
D．A machine.
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