According to the conversation, the main benefit of the overhead projector is that A．it produces a visual effect and makes the talk more dynamic. B．it makes the talk well delivered and more attractive to the audience. C．it helps the audience build their confidence and get involved in the talk. D．it helps the speaker get more chance of being employed.
A.it B. B．it C. C．it D. D．it E.
【参考答案】
B 投影仪作为视觉工具，能产生一定视觉效果，但录音没提到投影仪会使演讲变得生动或是增加被聘用的机会，因此可排除A......