Question

In our class, when the bell rang and the teacher closed his book, it was a ____ for everyone to stand up.

A. signal　 B. chance　 C. mark D. measure

 

Answer 1

A

句意: 在课堂上, 铃声响起, 老师合上书就是我们要起立的信号。signal信号, 导火线; chance机会, 运气; mark分数, 标志; measure措施, 办法, 尺寸。又如: This is a signal that you are breaking down.这是你身体逐渐变垮的信号。The signal that the war broke out between two countries is oil.两个国家爆发战争的导火线是石油。