高一外研版英语必修一五单元课文，关于科学那篇

Mark Kendon's Feelings About...
My feelings about science have really changed. I never used to enjoy science, but last year I changed schools, and the science teachers at my new school are excellent. The science facilities are very good, with laboratories that have all the latest equipment. Our chemistry teacher, Mr. Longford, takes us to public science lectures about four times a term, and these are always very interesting, as the lecturers are people who have made real discoveries in their area of science. The fact is, Canada has many first-class scientists. In the last twenty years, seven Canadian scientists have won the Nobel Prize! The Nobel Prize is the highest scientific prize there is, so we should be very proud of that.
I'm becoming more and more interested in physics, and have decided that I want to study it at university. I'm going to try to go to either Montreal or Ottawa University, as both are supposed to have good Physics Departments. My parents are astonished. They always thought I would become an English teacher!

Passage A
It is hard to think of a world without metals. Different metals have different uses, for example, steel is used in cars, and iron is used in electrical equipment. When we use metals, it is important to know how they react with different substances, for example, water and oxygen. The reaction of metals with these substances can be put in order. Here is a table with the metals that react most at the top, and the metals that react least at the bottom.

Passage B
A Simple Scientific Experiment
Below is a description of a simple scientific experiment. It shows us how iron reacts with air and with water.
Iron in dry air
Method
1. Put some iron nails at the bottom of a test tube.
2. Push some cotton wool down the tube.
3. Leave the tube for one week.
Result
After one week, the nails have not rusted.
Conclusion
Iron does not rust in dry air.
Iron in air-free water
Method
1. Half-fill a test tube with water.
2. Boil the water for three minutes. (This makes sure there is no air in the water.)
3. Put two or three clean nails in the water.
4. Add some oil to the water. This will keep air out of the water.
5. Leave the tube for one week.
Result
The nails do not rust in the tube with air-free water.
Conclusion
Iron does not rust in air-free water.
Iron in ordinary water
Method
1. Half-fill a test tube with water and add two or three clean nails.
2. Leave the tube for one week.
Result
The nails rust in the tube with ordinary water.
Conclusion
Iron rusts in ordinary water.