第28题: [单项选择]Questions 19 to 21 arc based on the conversation you have just heard. A. He is a professional electrician. B. He possesses a basic knowledge of electricity. C. He knows nothing about electricity. D. Electricity is his major. 参考答案:B 答案解析:[听力原文]19-21 W: Well, how are you doing M: Fine. The computer section is coming along nicely.