T: That's a good idea. There are so many patients with cancers in the world, who are suffering a lot. Thank you!

　　S: I want to be an English teacher like you. For one thing, I like English very much; for another, you are not only strict with us but also patient with us. You are just our friends and maybe more than our friends sometimes.

　　T: I'm really glad to hear that. It's my great honor to be your friends and I like my job very much.

　　S: I'd like to be an expert in environment. You see, with the development of industry, our globe is seriously polluted. Dirty water, polluted air, and loud noise make our living conditions worse. I think we should leave a beautiful world to the next generation.

　　T: Yes, someone predicted that the last drop of water in the world would be the tear of human being's. I think all of us should pay attention to our environment, and make our contributions to improving the environment.

　　S: I'm so interested in physics. And I have read Stephen Hawking's A Brief History of Time twice. I hope I will be a scientist like him. As we all know, the development of our society will go hand in hand with the development of science.

　　T: Yeah, I can't agree with you more. Science plays an important part in the development of our society. There are so many examples in the history of human beings.

　　Ss: ...　

　　T: I'm so glad to share your dreams. Your ambition and careful thoughts really leave a good and amazing impression on me. I like them. In this unit, you will learn something about "Great scientists". Maybe you will know what you need in your efforts to realize your dreams after we talk about some world-famous scientists. Before we come to "Warming up", I'd like you to come to the new words in this unit, which will help you to learn this unit.

　　Step 3 Word puzzles

　　T: Open your books and turn to Page 92.Let's read the words and expressions together.

　　(Let the students read the words and expressions together. Help them pronounce the new words and expressions correctly. Later give them some time to practise reading and remember some easy and important ones. Give more help to those who are poor in pronunciation.)

　　T: Here are some definitions of some of the words from this unit. Please work in pairs and match the words with their definitions.(group competition)

　　Words　　 Definitions or explanations

　　A. examine 1.general principles of an art or science

　　B. repeat 2.say or do again

　　C. theory 3.at once; without delay

　　D. immediately 4.look at...carefully in order to learn about or from...

　　E. complete 5.of great value, worth or use

　　F. valuable 6.having all its parts; whole; finished

G. announce 7.make known