45. this is a cure graph which describes the trend of... 这个曲线图描述了...的趋势。
46. There is a general discussion these days over education in many colleges and institutes. One of the questions under debate is whether education is a lifetime study.当前在高校和研究机构对教育存在着大量争论，其中一个问题就是教育是否是个终身学习的过程。
47. Strike while the iron is hot.趁热打铁。
48. the table shows the changes in the number of...over the period from...to... 该表格描述了在...年之...年间...数量的变化。
49. Using bicycle contributes greatly to people’s physical fitness as well as easing traffic jams.使用自行车有助于人们的身体健康，并极大地缓解了交通阻塞。
40. Nowadays, many students always go into raptures at the mere mention of the coming life of high school or college they will begin. Unfortunately, for most young people, it is not pleasant experience on their first day on campus.当前，一提到即将开始的学校生活，许多学生都会兴高采烈。然而，对多数年轻人来说，校园刚开始的日子并不是什么愉快的经历。