Unit 16 Scientists at work

Warming up

Listening

Speaking

Warming up• What are they doing in the following pictures?

• Where do they do experiment?

In Chemistry lab In Physics lab

In Biology lab

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

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• 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.

• 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.

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

• 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.

• 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.

Speaking• Do you know this train?

high-speed maglev train

• Do you think this train is helpful for people? Why?

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

Pair work• Work in groups, and discuss the advantages and

disadvantages of the following scientific discoveries and applications:

Advantages Disadvantages

Cloning

Nuclear energy

Computers

Space flights

Advantages Disadvantages

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

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?

Dos Don’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.

Dos Don’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?

Dos Don’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.

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 opportu

nity 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.

In my opinion it’s a waste oftime

make full use of

add to

Take care

Summary• Usefully expressions:

AdvantagesIt 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.

DisadvantagesIt 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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