第29题: [单项选择]Passage One Questions 26 to 28 are based on the passage you have just heard. A. They smoke the cigarettes at home. B. They burn the cigarettes in the kitchen. C. They leave the cigarettes burning. D. They put the cigarettes in the ashtray. 参考答案:C 答案解析:[听力原文] How do the smokers run the risk of causing a fire
[听前猜测] 通过选项可以推测题干询问吸烟者如何导致火灾。 第30题: [单项选择]下列哪个颜色的波长为最长 A. 紫色 B. 黄色 C. 红色 D. 绿色 参考答案:C 答案解析:[解析] 光谱中7种颜色的波长由长到短的排列顺序为：红—橙—黄—绿—蓝—靛—紫，波长依次变短，频率依次变大。
