第2题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard.[A] The class thought the demonstration was too complex. [C] The professor didn’t show up. [B] Too many students showed up. [D] The professor cancelled it. 参考答案:D 答案解析:[听力原文] W: Why didn’t you have your geology class today M: Only three out of a class of twenty
第11题: [多项选择]下列能源中属于二次能源的是< )。 A. 电力 B. 天然气 C. 煤油 D. 焦炭 E. 汽油 参考答案:A,C,D,E 答案解析:[解题要点] P 89项目建设节能的原则与要求。能源一般分为一次能源和二次能源。煤、石油、天然气等，没有经过加工或转化，称为一次能源；煤气、电力、汽油、煤油、焦炭等，是在一次能源的基础上经过加工转化而
