Questions 14 to 17 are based on the following passage.
At the end of the passage, you will be given 20 seconds to answer the
questions. Now listen to the passage. If no signal is sent from the command spot, what will happen to the train
A.It will stop automatically. B.It will move on at the same speed. C.It will gradually slow down. D.It will keep a safe distance from the other trains.