Module 5课文重点、难点解析
1. Iron doesn't rust in dry air. 在干燥的空气中铁不容易生锈。
在此处rust作不及物动词，说明主语的特征。谓语动词要用主动形式。常见的同类动词有：sell, write, dry, wash, open, move, lock等。例如：
The oranges sell well. 这些橘子很畅销。
注意区分：系动词taste, look, smell, feel, sound等后面要接形容词作表语。例如：
The oranges taste good. 橘子尝起来好吃。
2. Half-fill a test tube with water. 给玻璃试管灌一半水。
fill...with使......充满；be filled with... 用......装满
类似的词组有：
be crowded with挤满
be covered with 被......覆盖
be marked with 标上......记号
be dotted with用......点缀着
be lined with 沿着；两旁排列着
be equipped with 用......装备
3. I never used to enjoy science, but last year I changed schools, and the science teachers at my new school are excellent. 我过去从来没有喜欢过理科，但去年我换了学校，而且新学校的理科老师们非常出色。
used to do sth. 表示过去常常做某事。例如：
John used to visit his parents once a week when he worked as an assistant in the city.约翰在城里当服务员的时候，总是每周去看望父母一次。
拓展:1) be used to do sth. 被用来做某事。例如：
Wood can be used to make paper. 木材可以用来造纸。
2) be/get used to sth./ doing sth. 习惯于做某事。例如：
He was used to sleeping with the windows open. 他习惯敞着窗子睡觉。
4. The Noble Prize is the highest scientific prize there is，so we should be very proud of that。诺贝尔奖是科技领域曾有过的最高奖项，因此我们应以此为骄傲。
此处there is 是定语从句，修饰prize，表示曾有过的。例如：
The home improvements have taken what little there is of my spare time. (NMET2001)房屋装修占据了我那么少的业余时间。
5. ...as both are supposed to have good physics Departments.因为两所大学都应该有最好的物理系。
be supposed to +不定式短语，可以表示"应该""理应"含有"本来应该做某事，而事实上并非如此"之意。例如：
Everyone is supposed to wear a seat belt in the car. 坐车时每个人都应该系安全带。