第1题:[多选题]发生煤炭自然发火的预兆有( )。 A. 煤层及附近空气温度和水温增高 B. 自然发火初期巷道中湿度增大,出现雾气和水珠,煤壁出汗 C. 空气中氧气浓度下降 D. 出现一氧化碳、二氧化碳等气体,人体产生不适感 E. 自然发火初期空气中出现煤油、汽油、松节油等气味 参考答案:ABCDE
第2题: [单项选择]{{B}}Questions 11 to 18 are based ma the conversation yon have just heard.{{/B}} A. Some people pretend to know what they really don’t. B. What the woman said is true. C. What the woman said is wrong, D. He knows more than the woman does. 参考答案:A 答案解析:[听力原文]
W: Some people know a lot more than they tell.
M: Unfortunately the reverse is also true.