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B.Open the door.
C.Ask for help.
D.Leave the seats. (2)Which of the following is true when you hear a "beep" sound
A.Close the door.
B.Rush onto the train. C.Get off the train at once.
D.Stop and wait for the next train. (3)Which is the good behavior(行为)on the train according to(根据)the text
A.Run on the train.
B.Eat on the train. C.Sing on the train.
D.Give your seat to the o
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