Unit 1 Great Scientists教案

stephen hawking
after all the questions, then lead in the passage with a picture. ask ss if they know the map and what it is used for. give them the answer later “it is a map to find out the cause of cholera. ”
step 2 skim and scan
more questions are given to get the general ideas of this passage and some obvious facts.
who defeats “king cholera“? john snow
what happened in 1854?   cholera outbreak hit london.
how many people died in 10 days? 500
why is there no death at no. 20 and 21 broad street as well as at no. 8 and 9 cambridge street?
 these families had not drunk the water from the broad street pump.
step 3 reading for details
1 why couldn’t the cholera be under control at first?
neither its cause, not its cure was understood.
2 which theory did john snow believe in?
people absorbed cholera into their bodies with their meals.
3 john snow finally proved the theory he believed by ________.
gathering information with the help of a map
looking into the source of the water for broad street and cambridge street
separating those who suffered cholera from those who didn’t
both a and b (right choice)
4 to prevent the cholera from spreading again, what did john snow do?
suggested that the source of all water supplies be examine. suggested that new methods of dealing with polluted water be found. instructed the water companies not to expose people to the polluted water anymore.
step 4 mind map of the passage
paragraph 1: introduction of john snow and cholera
paragraph 2: two theory
paragraph 3-5: study of the breakout in 1854                      
paragraph 3: think of a method: test two theory
collect the result: mark the death
analyze the result: reason for death and no death
paragraph 4: analyze the result: find the resource of the water 
paragraph 5: repeat if necessary: find more evidence.
draw a conclusion: cholera was spread by germ
polluted water carried cholera
paragraph 6: prevention of cholera
step 5. careful reading
1.ask the ss to read the text carefully and then finish the chart in ex. 1 on page 3.
scientific report by john snow
the problem nobody knew the cause of the serious disease
of cholera.
the cause idea 1: strange cloud in the air that attacked victims.
idea 2: people absorbed the disease with their meals.
the method  collect data from the next cholera attack to test theories. try to prove which method was correct.
the results  he found the cause of cholera was the polluted water.