题目：
假设你是李华，今天上午第一节课上外教老师Michael的课迟到了，Michael要求你用英语写一份解释说明，内容要点如下：
已提供的句子不算在五句内。 Dear Michael, I am terribly sorry that I missed the first part of your class this morning. Now I am writing to explain to you what happened. ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ I hope you can forgive me. Yours, Li Hua |
答案：
Dear Michael,
I am terribly sorry that I missed the first part of your class this morning. Now I am writing to explain to you what happened.
At 6:45 this morning, I was waiting for the bus to school at the stop when an old man standing nearby fell onto the ground. I came closer and found he had fainted. Fortunately, a doctor, who happened to be there, started to give first aid to him. Meanwhile I dialed 120. We didn’t leave the man until the ambulance came 10 minutes later, and that’s why I was 7 minutes late for class.
I hope you can forgive me.
Yours,
Li Hua
题目分析：这是一篇提纲类作文，你向外教解释迟到的原因。建议以时间为顺序来组织全文。本作文中给出的要点比较具体,故需要准确表达，我们需要用正确的英语把给出的要点表达出来.写作时注意准确运用时态，上下文意思连贯，符合逻辑关系，尽量使用自己熟悉的单词句式，同时也要注意使用高级词汇和高级句型使文章显得更有档次。特别注意在选择句式时要赋予变化，尤其是时间和数字的表达法。
点评：本文属于提纲类作文，动笔前，一定要认真分析要点，理解要点要表达的含义，不能遗漏要点，跑题偏题。平时除了加强词汇积累，写作联系以外，还可以适当记忆一些类似的范文，这样在考试中可以起到事半功倍的效果。
N2O4(g)；△H＜0。在恒温恒容条件下，将一定量NO2和N2O4的混合气体通入容积为2L的密闭容器中，反应过程中各物质的物质的量浓度c随时间t的变化关系如下图所示。
