第4题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard A. He got an electric shock. B. The chocolate in his pocket melted. C. The power tube exploded suddenly. D. He was hurt by the radiation. 参考答案:B 答案解析:[听力原文] Q: What happened to Percy Spencer when he stood next to a power tube [答案详解] 在介绍微波炉