第1题: [单项选择]Questions 29 to 31 are based on the passage you have just heard. A. Gold was discovered. B. The transcontinental railroad was completed. C. The Golden Gate Bridge was constructed. D. Telegraph communications were established with the East. 参考答案:A 答案解析:[听力原文] 29-31 From this lookout we enjoy one of the most spectacular views of San Francisco. A