1signal v．发信号；示意；表明；标志n.信号；暗号；标志；信号灯
基础练习——单句语法填空
①The policeman signalled to the car________ (stop) to ensure the pedestrian could cross the street safely.
②The bell rang，________ (signal) that school was over，and students rose to their feet，seized their schoolbags and rushed out of the classroom like arrows.
能力提升——读后续写生动表达
③那个善良的人抱起受伤的男孩，把他放在车里，匆忙把他送到医院，忽视了一路上的交通信号。
The kind man lifted up the injured boy，placed him in the car and rushed him to the hospital，______________________________．
(1)signal (to) sb. to do sth.
示意某人做某事
signal sb. that... 示意(某人)……
(2)send out a signal 发出信号
a traffic signal 交通信号
