【点此跳转到参考答案】

　　81、为了掩盖被火烧过的痕迹，整个建筑被粉刷为白色。不久之后它就以白宫闻名了。

　　82、他的实验对象是75名大学生。他们的英语能力代表了各种水平层次：初始级、中级、以母语为英语。

　　83、尽管如此，牛仔们喜欢他们的生活方式。他们住在旷野中，过着自由、冒险的生活。

　　84、每四人需要一匹马或骡子，这个比率几十年来几乎是一成不变的。

　　85、他们就难免得出这样的结论， 马和骡子的数量会迅速减少。

　　84、我急匆匆按时赶去上课，试着从一堆乱糟糟的之中整理出笔记，不敢确定今天要谈什么话题，甚至不确定要讲授什么课程。

　　85、我又一次以昏死在地板上结束了噩梦。醒来后，床单由于我的绝望被汗浸湿了。

　　86. Now what is important is that every one of us should know what to do how to do it.

　　87. I used to go to the cinema a lot, but I never have the time now.

　　88. We must have respect for the needs of the average reader.

　　89. Although he had only entered the contest for fun, he won the first prize.

　　90. The lawyer’s advice led to the resolution of this difficult problem.

　　Part V 参考例文

　　What Makes a Good University

　　Everyone is cautious about choosing a good university to receive higher education because studying at a good university may be a turning point in your life and bring you a brilliant career in the future. But do you have a clear idea about what a good university is?

　　In my opinion, there are some critical factors contributing to a good university. First of all, the vital one lies in the motto and mission of a university. As Yale University’s mission is to train for public service, a good motto or mission lets a university and its students be able to reach something tangible and leads them to the way to success. Secondly, academic atmosphere is of great importance as well. A good university should have a great academic atmosphere so that its students are enthusiastic to involve themselves in a group brainstorming and learn from each other. What’s more, it’s also absolutely necessary to have excellent teaching staff and facilities. Learned tutors can give a had to smooth students’ road to success and students can take part in various interesting extracurricular activities with the help of well-equipped facilities. Only in this way can they achieve their well-rounded development.