人教新课标高中英语必修五 unit1 Great scientists Reading 课件（共18张PPT）

(共18张PPT)
Unit 1
Great scientists

Reading
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2
3
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Find a problem
Make a question
Think of a method
Collect results
Analyse the results
Find supporting evidence
Draw a conclusion
John Snow Defeats “King Cholera”
John Snow (1813-1858) was born and worked as a doctor in Great Britain. He was originally an anaesthetist (麻醉师).
Background
What do you know about infectious diseases?
a kind of infectious diseases
spread from one person to another.
What do you know about cholera?
It is a kind of terrible disease caused by drinking dirty water and it caused a lot of deaths in the old times and it was very difficult to defeat.
Is it the right way?
1). What’s the main idea of the passage?
John Snow was a well-known doctor in London.
The cause of Cholera was polluted water.
The source of all drinking water should be examined.
How John Snow collected, analyzed data and found the cause of the disease and solved it .
2 John Snow finally proved the theory he believed by ________.
A. gathering information with the help of a map
B. looking into the source of the water for
Broad Street and Cambridge Street
C. separating those who suffered cholera from those who didn’t
D. both A and B
John Snow began to test two theories.
An outbreak of cholera hit London in 1854.
John Snow marked the deaths on a map.
He announced that the water carried the disease.
John Snow investigated two streets where the outbreak was very severe.
King Cholera was defeated.
He found that most of the deaths were near a water pump.
He had the handle removed from the water pump.
8
5
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number these events in the order that they happened.
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2
3
4
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draw a conclusion
find a problem
make up a question
think of a method
collect results
analyse the results
find supporting evidence
Para 1
Para 2
Para 3
Para 4
Para 5
Para 6
Para 7
Careful reading
Read the passage paragraph by paragraph carefully,then answer these questions
1.What was the most deadly disease in 19th century?Why?
2.When could the cholera be controlled?
cholera, because neither its cause,nor its cure was understood.
John Snow knew it would never be controlled until its cause was found.
Which theories did John Snow believe in?
Cholera multiplied in the air. A cloud of dangerous gas would float around until it found its victims.
People absorbed it with their meals.
Then which one did he suspect was correct?
A map of Broad Street
What method did he use?
Broad Street
Many deaths happened here.
No death happened here.
The water from the pump was to blame.
Public house
analyze the results: What happened to the pump water?
The water was from the river which had been polluted by the dirty water from London.
find supporting evidence : What extra evidence did he find?
A woman and her daughter who lived far away but drank the water also died.
draw a conclusion with certainty
The polluted water
carried the disease.
What should we pay attention to in our daily
life in order not to get infected with cholera?

Heat the food left overnight
Cook raw food thoroughly
Wash hands often
Keep away from flies
choose fresh sea food
Keep the kitchen clean
Dispose rubbish properly.
Drink boiled water