听力原文：

Body language is used by people for sending messages to one another. It is very useful because it can help you make yourself easily understood. When you are talking with others, you are not just using words, but also using expressions and gestures. For example, waving one’s hand is to say “goodbye”. Smiles and handshakes are welcoming, and clapping hands means congratulations. Nodding the head means agreement, but shaking the head means disagreement. Many gestures are accepted by both Chinese and foreigners as having the same meanings. 

答案：6. C