题目

Having good communication skills is important. They can help you with performances in class, during the job hunting, having arguments and in a variety of other situations. 【1】1. Understanding the basics of communication skills.Communication is the process (过程) of delivering signals or messages between a sender and a receiver through various methods. 【2】2. Trying to attract the attention of your audience.Whether you are speaking or listening, looking into the eyes of the person with whom you are having a conversation with can make the communication more successful. Eye-contact expre如图是李大妈跳舞用的扇子，这个扇形AOB的圆心角∠O=120°，半径OA=3，则弧AB的长度为    （结果保留π）．