Unit 21
Lesson 3 Epidemics explained
Teaching aims
1.words and phrases：
2.language points in the text
3.reading strategies
4.exercises about text
5.vocabulary:synonyms
Teaching time
Two periods(两课时连堂)
Teaching process
Step 1 Revision
have a diction about the new words in lesson 2
Step 2 learn the new words of lesson 3
1.ask some students to read the new words first and correct their pronunciation
2.play the tape and have them read after the tape
3.give them a few minutes to read the new words freely, tell them if they can’t read the words, encourage them to ask the teacher .
step 3 reading
1.ask students read the key words in exercise 1 and guess their meaning.
2.let them discuss in pairs which of these diseases can be or are epidemics
2.do exercise 2 by themselves in pairs.then check their answers on page 103
3.let the students read Reading Strategies.
4.students then read quickly through the text to get a general idea of it.
5.students complete the text with the missing paragraphs.
6.check their answers by having individuals read out the complete text.
7.give students a few minutes to do exercise 4.
step 4 language points
1.epidemics explained
2.epidemics throughout history
3.with new health threats on the rise.
4.look at
5.since the beginning of life on earth
6.as long as
7.as early as 430 BC
8.on record
9.be attempt to do sth.
10.sweep through
11.die from the disease
12.be known as
13.a lack of
14.provide the perfect conditions for..
15.in highly populated areas all over Europe
16.one half to lne third of the population was lost to the Black Death
17.it is believed to be…
18. die of the flu
die in the war
19.begin with,end with
20.the number of
21.such as
22.natural defences
23.be harmful to
24.make up
25.expand across
step 5 vocabulary:synonyms
1.exercise 6
a)ask the students to do the exercise individually.
b)then check their answers
2.exercise 7.
a)ask some students to come to the blackboard to do the exercise
b)check their answers
step 6 Homework
copy the new words


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