1. Unit 16 Scientists at work Warming up Listening Speaking

2. Warming up What are they doing in the following pictures? Where do they do experiment? In Chemistry lab In Physics lab In Biology lab

3. Listening 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 √ √ √ √ √

4. 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 ， when smelling from the bottles? _The bottles_______________________________. Safety comes first! Follow the teacher’s instructions. Bottles may contain dangerous gases.

5. 4. What is to be done when anything gets into your eyes? _____________________________________ 5. What should students do before leaving the lab? ______________________________________ ______________________________________ ______________________________________ _______________ Immediately wash your eyes with lots of water. 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.

6. 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 come 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 up, or put their

7. hair under their clothes. Always listen carefully to your teacher’s instructions and don’t touch anything, unless your teacher tells you to. Mr. Deng: Can you explain a bit more about doing experiments? Mrs. 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 mouth or eyes, immediately wash with a lot of water. Remember that the classroom isn’t a playground.

8. Don’t throw things or start playing. That can be dangerous. Sun Yao: What should be done when we leave? Mrs. Zhu: When class is over, clear everything away and leave the classroom neat 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.

9. Speaking Do you know this train? high-speed maglev train Do you think this train is helpful for people? Why?

10. Dialogue Listen to the dialogue and learn the following expressions: in my opinion a waste of money it’s much too expensive. in the future flying is just as fast. mean v. make any noise as planes do make use of

11. Pair work Work in groups, and discuss the advantages and disadvantages of the following scientific discoveries and applications: AdvantagesDisadvantages Cloning Nuclear energy Computers Space flights

12. AdvantagesDisadvantages Cloning Help women have babies; help medical research It is not natural to make people; dangerous;people use it to do strange things. Nuclear energy Make all the electricity we need; is a limitless resource Unsafe to all life if not controlled; can be expensive to build Computers Makes communication faster; keep information better Unsafe because of viruses; makes more problems than it solves Space flights Makes research of out space possible; put communication satellites in space Expensive and dangerous; used by the army

13. Talking Read about the following situation that could be dangerous and think of proper safety instructions. 1. It suddenly starts raining with thunder and lightning. What are the things you should do and what are the things you should not do? DosDon’ts 2. You will do a science experiment in a physics class. Remember the safety instructions from the physics lab and practise them in English.

14. DosDon’ts 3. You want to go on a hiking trip in the mountains. What are the things you should do and what are the things you should no do? DosDon’ts 4. You want to do a science experiment in a chemistry class. Remember the safety instructions from the chemistry lab and practise them in English.

15. Practice 根据所给中文，用英语完成下列各句，每空一词。 1 、在我看来，和他争论是浪费时间。 ____ ____ ________, ____ ____ ______ ____ ______ arguing with him. 2 、你必须充分利用一切机会练习英语。 You must ______ ______ _____ ____ any opportunity to practice your English. 3 、请在牛奶中加点糖。 Please ____ some sugar ____ the milk. 4 、注意在实验开始之前把一切都准备好。 ______ ______ that everything is prepared before the experiment begins. Inmyopinionit’sawasteof time makefull use of addto Takecare

16. Summary Usefully expressions: Advantages It is good for… It can help…in the future. It is clean and does not pollute the air. It is important for science. It brings people more comfort. Disadvantages It is too expensive. It is dangerous or bad for your health. It is bad for the environment. It is unnecessary. Some people will use it for other things.

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