S: Zhang Heng.

　　T: Do you know what he invented?

　　S: He invented seismograph.

　　T: Who put forward a theory about black holes?

　　S: Stephen Hawking.

　　T: He wrote a famous book. What's the title of it?

　　S: A Brief History of Time.

　　T: All of you did a good job. For the time being, the first/second...group won the competition. But there are a lot of chances for you to catch. We will continue our competition later.

　　Step 3 New Words

　　T: Today we are going to read a new passage about another scientist named John Snow. First let's come to new words first. Here are some definitions of some of the words from this text. Please work in pairs and match the words with their definitions.

A. attend

B. control

C. handle

D. blame

E. absorb

F. announce

G. immediately

H.be linked to

I.in addition

J. expose 1.have control, authority, power over

2.part of a tool, bucket, drawer, etc.by which it may be held in the hand

3.take or suck in

4.at once or without delay

5.uncover, leave uncovered or unprotected

6.as well, besides

7.be joined with, be connected with

8.wait on, serve, look after

9.fix on sb. the responsibility for sth. done or not done

10.make known 　　Suggested answers:

　　B-1　C-2　E-3　G-4　J-5　I-6　H-7　A-8　D-9　F-10

　　Step 4 Pre-reading

　　T: There are so many scientists that we can't count them. But all the scientists must have their scientific attitude and scientific way to do scientific research. Now open your books on Page 1.Look at the questions in Pre-reading quickly and discuss them with your partner in two minutes.

　　(Teacher gives the students two minutes to discuss. After that, the teacher asks them to answer the three questions.)

　　T: First, let's talk about infectious diseases. Can you name some? Let's come to a group competition again. If you get your answer right, I'll give you ten marks.

　　Ss: Bird flu, SARS, cholera...

　　T: What do you know about cholera?

　　S: Cholera was a 19th century disease.

　　S: Cholera was spread by germs.

　　S: It was the most deadly disease of its day.

　　S: People who are infected with it will be easy to die.

　　S: ...

T: Excellent. Now, let's come to Question 2.How can we prove a new idea in