高中英语Unit 21 Lesson 3 Epidemics Explained 1北师大版选修7

Unit 21 Lesson 3 Epidemics explainedTeaching aims1.words and phrases：2.language points in the text3.reading strategies4.exercises about text5.vocabulary:synonymsTeaching timeTwo periods(两课时连堂)Teaching processStep 1 Revisionhave a diction about the new words in lesson 2Step 2 learn the new words of lesson 31.ask some students to read the new words first and correct their pronunciation2.play the tape and have them read after the tape3.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 reading1.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 epidemics2.do exercise 2 by themselves in pairs.then check their answers on page 1033.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 points1.epidemics explained2.epidemics throughout history3.with new health threats on the rise.4.look at5.since the beginning of life on earth6.as long as7.as early as 430 BC8.on record9.be attempt to do sth.10.sweep through11.die from the disease12.be known as13.a lack vide the perfect conditions for.15.in highly populated areas all over Europe16.one half to lne third of the population was lost to the Black Death17.it is believed to be18. die of the fludie in the war19.begin with,end with20.the number of21.such as22.natural defences23.be harmful to24.make up25.expand acrossstep 5 vocabulary:synonyms1.exercise 6a)ask the students to do the exercise individually.b)then check their answers2.exercise 7.a)ask some students t