第21题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.{{/B}} A. The discovery of oil B. The interest in wildlife. C. An increase in the birthrate. D. An improvement in building materials. 参考答案:A 答案解析:[听力原文]
What is the cause of the recent changes in Alaska
A. Workers made tunnels through ice. B. Construction workers often use oxygen bottles to breathe. C. The new railway will use ordinary trains. D. The new line is to start operation in 2006. 参考答案:C