第32题: [单项选择]{{B}}Questions 30 to 32 are based on the passage you have just heard.{{/B}} A. By asking some students to explain the reason. B. By giving them a test on the speed of sound. C. By using a vivid question to check them. D. By asking the students to restate his words. 参考答案:C 答案解析:[听力原文]30-32
Professor Wang is a physics teacher in Beijing. Once she was explaining to one of he