单项选择题
A．the importance of eye contact B．the potency of nonverbal techniques C．successful speech delivery D．an effective way to gain visual feedbacks
A．help the speaker to control the audience B．help the speaker to gain audience interest and esteem C．help the speaker to know whether he is talking too much about a certain point D．help the speaker to analyze his audience when he is beginning his speech
A．"sell" his or her ideas to an audience B．maintain direct eye contact with listeners C．be very persuasive and believable D．be exceptionally well-disposed