【正确答案】The professor talks about the different types of nonverbal communication, and what they mean. First, he says that nonverbal signals can reinforce what someone is saying. The way people do this is by making direct eye contact, having strong body language, and using an even tone of voice. For instance, when you ask your friend out to lunch, and she looks at you and says "yes" in a clear voice, then she really wants to come. On the other hand, nonverbal signals can also contradict the message. In this case, people often avoid eye contact, or have weak body language, or sound unclear. If your friend replies like this to a lunch invitation, it means she probably doesn't want to come. Even if she says "yes", she isn't being sincere.

【答案解析】[听力原文] So, there are all kinds of ways we can communicate meaning nonverbally. Like the reading said, eye contact is one of these signals. Staring intently at someone can make them feel that you're angry or upset with them...but, if you look away too often, it might be interpreted as boredom or lack of interest on your part. And the way you carry your body is another major nonverbal signal. Traditionally, slumped-over posture indicates fatigue or a negative attitude about what's being discussed. And let's not forget tone of voice. The same words can have very different meanings depending on whether you say them sarcastically, loudly, jokingly...Let's come up with a quick example to illustrate this idea of nonverbal signals. Say... you run into a friend at the mall, and you ask them to have lunch with you. If your friend looks you in the eye and smiles, and, uh...says "yes" in a strong tone of voice, it's obvious that they're genuinely happy to have lunch with you. On the other hand...maybe before they answer they look down at the floor, or kind of slump their shoulders and then mutter something. No matter what words they use, you can interpret that they don't like the idea. In this case, it's not really what they say, but how they say it, right?