The policeman asked him ______ detail of the accident.

A．The teacher must learn everything by heart.
B．He knows to control his voice better than an actor.
C．He has to deal with unexpected situations.
D．He has to use more facial expressions.

A．A teacher’s voice must be nicer than an actor.
B．A teacher cannot decide beforehand what exactly he is going to say in class.
C．A teacher must have better memory than an actor.
D．A teacher has to learn by heart what exactly he is going to say in class.