【正确答案】 B

【答案解析】[听力原文] Well, to continue, as I mentioned earlier, there is also research that demonstrates that individuals perform worse, not better, on tasks when other people are there. R. W. Harburt did an interesting experiment. He had his subjects learn a finger maze. This is a game in which you indicate with your finger the way through a complex system of passages or paths. The subjects who had an audience did worse than the subjects who did alone. Now how can we explain these very different results? It seemed very confusing for a long time. Social psychologist, John Roberts, finally cleared up the confusion about why people sometimes perform better and sometimes worse in front of an audience. Roberts found that the presence of an audience facilitates what you already know how to do. That is, if you know what you are doing, having an audience helps you do it better. But if you don't already know how to do something, you will probably make some mistakes and you will make mistakes for a longer time if you have an audience. That's exactly what happened to the subjects who were learning the finger maze. So, if you are doing well, having an audience increases the chances that you will continue to do well. If you are doing badly, having an audience increases the chances that you will continue to do badly. Roberts cleverly pointed out that when you are first learning something, you are better off working alone than practicing with other people. What did the speaker probably discuss before coming to this part of the talk? 原文的第一句翻译过来是：“现在，我们继续，正如我先前提到的那样，还是有研究证明个体在群体面前表现更差，而不是更好。”由这一句可以推断，在这个话题之前，谈及的是个体在群体面前表现更好的情况，故选项B正确。

【正确答案】 C

【答案解析】[听力原文] When does the presence of an audience facilitate your performance according to Roberts? 根据文意可知，Roberts认为，当人们对白己要做的事情很有信心，非常清楚怎么做的时候，现场的观众能够促进他们的表现。由此可知，当个体对于所做事件非常了解时，现场的观众可以起到好的作用。故选项C正确。

【正确答案】 B

【答案解析】[听力原文] What does Roberts think is a better way to learn new things? 原文结尾处提到，Roberts认为，个体在学习新知识的时候，最好找到一块没人的地方单独训练，而不是和别人一起训练，因为这样做的效果更好。由此可知，学习新东西时应该自己单独练习，故选项B正确。