1、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 l esson 2 Step 2 learn the n
2、ew 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 cant read the words, encourage them to ask the teacher . step 3 reading 1.a
3、sk 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 S trategies. 4.students then read quickly thro
4、ugh the text to get a general idea o f it. 5.students complete the text with the missing paragraph s. 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.
5、with new health threats on the rise. 4.look at 5.since the beginning of life on earth 6.as l ong 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 ove
6、r 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 an swers step 6 Homework copy the new words
