第25题: [单项选择]Questions 19-22 are based on the following dialogue:What do we learn about the use of solar energy in the U. S. A. It is very well established. B. It is relatively new. C. It is found in one million homes. D. It is being rapidly expanded. 参考答案:D 答案解析:[听力原文]19-22 W: Welcome to our program. Today Prof. Johnson is going to talking about solar power.