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Unit 16 Scientists at work

Teaching goals:

Talk about science and scientists

Practise giving instructions.

Learn to write an argumentative essay.

Discuss and evaluate Pros and Cons.

Astronomical telescope

The nature of lightning

Question : When you’re doing experiment in a lab, what should you pay attention to ?

Student1: We shouldn't’t enter the lab without a teacher.

Student2: We should follow the teacher’s instructions.

Student3: Don’t touch anything without teacher’s permission.

Students: -----

Listening

1. Listen to the tape. Tick the things that Mrs. Zhu talks about.

( ) safety in the lab ( ) gloves ( ) long hair

( ) experiments ( ) shoes ( ) liquids

( ) car accidents ( ) gases ( ) flames

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2. Listen carefully and answer the following questions.

（1） What is the most important thing students should remember?

Safety comes first!

（2） What is the first thing students should do when they come into the lab ?

Follow the teacher’s instructions.

（3） Why should students be careful smelling from bottles ?

Bottles may contain dangerous gases.

（4） What is to be done when anything gets into your eyes ?

Immediately wash your eyes with a lot of water.

（5） What should students do before leaving the lab ?

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.

Speaking

Example:

Building a High-speed Maglev Train

fast and clean / it has no wheels and no engine / it doesn't’t make any noise

Advantages

Disadvantages

It’ a waste of money. It’s much too expensive.

Oral practice:

Useful expressions

Useful / help medical research / save some rare species so that many animals will not die out.

Dangerous and unnecessary / unnatural / people look the same /

Cloning

Nuclear energy

The best way to make electricity instead of coal and oil / limitless resource / clean and doesn‘t’t pollute the air / cheap and good for the economy / used in military affairs (军事）

Nuclear waste is dangerous for people’s health and environment / expensive to build and keep functioning safely / unnecessary

Computers

make communication faster and store much information / important for science / good for economy / easy and useful in many respects

make people lazy / be into computer games / virus(病毒）/ have bad effects on people and society

Space flights

Interesting and exciting / be useful for scientific research on outer space

expensive and dangerous / used by the army

Homework

Review the new lesson and try to summarize how Franklin did experiments.