Unit 16 Scientists at work

The goals of this unit: 1.Talk about science and scientists 2.Practise giving instructions(给出说明） 3.Discuss and evaluate(评价) pros and cons 4.Study some rules of word formation 5.Learn to write an argumentative essay(议论文)

1.What are the subjects in which you learn science? Part1: Warming-up 1.What are the subjects in which you learn science? Science physics biology chemistry

2. Now,please look at these pictures,what can you see 2.Now,please look at these pictures,what can you see? What are they doing? Two students Some students An English book called Hamlet,a dictionary and a notebook Two students Are doing a physics experiment Are looking at something through a microscope Are at work in a chemistry lab.

3.Give an example of what you learn about for each field of science. (1) In chemistry __________ (2) In physics __________ (3) In biology __________

(1) In chemistry In chemistry we learn about the way different liquids and materials react(起作用,反应) with each other.For example,if you put a piece of metal into a glass containing a strong acid(强酸),it will dissolve(溶解).

(2) In physics In physics we can learn about the laws of the universe , for example about Newton(牛顿) and the reason why all the things on earth fall down.

(3) In biology In biology we learn about life on earth, for example by looking at the structure of cells（细胞结构）.

Part2:Listening 1.Listen to the tape,tick the things that Mrs Zhu talks about. ( )safety in the lab ( )gloves ( )gases ( )experiments ( )long hair ( )liquids ( )car accidents ( )shoes ( )flames Ѵ Ѵ Ѵ Ѵ Ѵ

2.Listen carefully and answer the following questions. 1.What is the most important thing students should remember? 2.What is the first thing students should do when they come into the lab? 3.Why should students be careful smelling from bottles? 4.What is to be done when anything gets into your eyes? 5.What should students do before leaving the lab?

The answers to exercise2: 1 Safety comes first! 2 Follow the teacher’s instructions. 3 Bottles may contain dangerous gases. 4 Immediately wash your eyes with a lot a water. 5 Clear everything away and leave the classroom neat and clean.Wash your hands with water and soap.Turn off the lights and shut the windows.

Listening text MR DENG:Everybody listen carefully! Today Mrs Zhu will explain about the safety instructions for the lab. If you have any questions,you can raise your hand. MRS ZHU:For experiments that are done in this lab,everybody should remember : Safety comes first! This is very important,because the experiments are fun and very interesting,but we don’t want any accidents. First of all,don’t came in here without your teacher.Once you’re in here,follow your teacher’s instructions.When you come into the lab,students with long hair should tie it up ,or put their hair under their clothes.Always listen carefully to your teacher’s instructions and don’t touch anything unless your teacher tell you to.

MR DENG:Can you explain a bit more about doing experiments GMRS ZHU:Sure .Never put your nose directly into a glass or over a bottle .Gases can be very dangerous. Instead, you should wave some air in your direction and carefully smell it.Never put your fingers into glasses and never taste anything !When working with fire,be careful about the flame.When working with electricity ,make sure your hands are dry. When anything gets into your eyes, immediately wash with a lot of water .Remember that the classroom isn’t a playground.Don’t throw things or start playing.That can be dangerous. SUN YAO:What about when we leave? MRS ZHU:When class is over,clear everything away and leave the classroom neat（整洁的） and clean, before leaving the classroom,wash your hands with water and soap.Don’t forget to turn off the lights and shut the windows.

Homework: Have a discussion to find out the best rules for the lab and recommend（推介） it to the school leader.

So much for thisc lass! Thank you! 乌审旗高级中学：刘鹏2006.3.15