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Unit21 Lesson3

学习目标

By the end of the class, the students will be able to: ? identify the structure of one type of discursive essays. ? use the strategies of sequencing to put the text back together. ? voice your feelings about epidemics. 学习过程 课前准备 课堂活动 （一） 预习交流 Check the answers. （二） 合作探究 Name of the Time Place Causes & 1.trial 2.prohibit 3.pause 4.tendency 5.acute 6.statistics 7.routine 8.press 9.tablet 10.thorough a) complete b) data c) delay d) habit e) media f) pill g) prevent h) severe i)test k) trend epidemics Bird Flu 1997— worldwide, Effects take ﹥100 lives 500-550AD North Africa, the Middle East, Europe Black Death Started in Asia, Europe, Africa, the Middle East 1918 Similar as the Black Death SARS China , Canada, Vietnam, Singapore Hong Kong,--- Exercise 4 Page 39

（三） 分层提高

Read the text again and fill in the missing information based on the text.

Five killer 1. ____________ are talked about in the text. They are Justinian Plague，2._______________, 3.______________, SARS and 4.____________. Justinian Plague, the earliest 5. ___________ about 500-550 AD when the Roman 6. _________ was attempting to 7.____________ the Roman Empire. This epidemic 8._________ through North Africa, the Middle East and Europe. It is supposed to 9.__________ up to 50% of the area’s population and thus led to the fall of 10.__________________.

The SARS epidemic appeared in 2002, as it was completely new, there were no 10___________ drugs or 11.______________ to treat it and doctors were not sure how to prevent it either. However, ever since then, 12.__________

have been done on 13. _____________ to prohibit any further 14.__________. Thanks to modern technology, medical workers all over the world are able to work together without pause to help put SARS 15. _________ us.

（四） 总结归纳

（五） 巩固反馈 Finish the exercise.