单项选择题
A．a good, strong and pleasing voice B．the ability to hold the attention of listeners C．you must be a clever speaker D．the ability to control unexpected situation
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．presents B．cleverness C．something that belongs to a good actor D．the way a teacher should act in class