[单项选择]Questions 19 to 22 are based on the conversation you have just heard. A. The coach is much cheaper. B. They cannot get good seats on the coach. C. She is carsick. D. The coach journey takes too much time.
参考答案:D 答案解析:[听力原文] What’s the biggest problem with the coach journey according to the woman
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第1题: [单项选择]能够发生瓦斯爆炸的最低瓦斯浓度值为()。 A. 瓦斯爆炸的上限 B. 瓦斯浓度 C. 瓦斯爆炸的最强浓度 D. 瓦斯爆炸的下限 参考答案:D