听觉信号：号角、口笛、（）和列车、轨道车鸣笛。
A、信号旗
B、响墩
C、信号灯
D、移动信号牌
参考答案：B
. Sometimes _________ English is quite different from ________ English in many ways.
A．speaking; writing
B．spoken; written
C．speaking; written
D．spoken; writing
迟后网络
