第36题: [单项选择]Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. When was the Tunnel opened to the public A. 1990. B. 1991. C. 1992. D. 1993. 参考答案:D 答案解析:[点拨] 原文中有"The tunnel was opened to the public in 1993"一句。